Julia, Marc; Chastrette, Francine published an article in 1962, the title of the article was 4-Substituted salicyclic acids.HPLC of Formula: 90326-61-7 And the article contains the following content:
The preparation of 4,3-HO2C(HO)C6H3(CH2)nCO2H (I) (n = 1, 2, 3) is described. m-AcOC6H4Me (600 g.) and 600 cc. powd. AlCl3 heated at 120-65° and steam distilled, and the distillate extracted with Et2O gave 470 g. 4,2-Me(HO)C6H3Ac (II), b0.6 82-4°, n2D4 1.5542; semicarbazone m. 218-20° (EtOH). II (167 g.) in 500 cc. aqueous NaOH heated 6 h. on a steam bath with 140 g. Me2SO4, treated again with 470 g. Me2SO4 and with a sufficient amount aqueous NaOH to maintain alkalinity, and extracted with Et2O yielded 180 g. 4,2-Me(MeO)C6H3Ac (III), b0.6 100-3°, m. 35-6°; semicarbazone m. 194-8°. III (192 g.) and 4.1 l. 1.4N NaOCl, 2.3-2.6N in NaOH, stirred several hrs., treated with aqueous NaHSO3, and acidified with concentrated HCl precipitated 184 g. 4,2-Me(MeO)C6H3CO2H (IV), m. 103-4° (aqueous EtOH). III (48 g.) treated with 900 cc. 1.7N NaOCl, 3.14N in NaOH, yielded 53 g. 3,5,4,2-Cl2Me(MeO)C6-H6CO2H, m. 175-6°. IV (93 g.), 900 cc. absolute MeOH, and 6 g. concentrated H2SO4 refluxed overnight, the mixture concentrated, poured onto ice, and extracted with Et2O gave 75 g. 4,2-Me(MeO)C6H3CO2Me (V), b22 142°, m. 29°, n1D8 1.5230. V (4.5 g.) in 100 cc. AcOH treated dropwise with 4.5 g. Br, the mixture stirred 3 h., kept overnight, diluted with H2O, and extracted with Et2O yielded 5.4 g. Me ester (VI) of 5,4,2-BrMe(MeO)C6H2CO2H (VII), m. 46°. VI saponified gave VII, m. 134-5°. IV (2.2 g.) in 40 cc. CCl4 refluxed and irradiated (W filament) with stirring, treated during 1 h. with 2.2 g. Br, heated 2 h., stirred 12 h., and filtered gave 2.44 g. VII, m. 135° (C6H6). VII (6.2 g.) in 90 cc. 95% EtOH and 30 g. Raney Ni-Al alloy treated dropwise with 300 cc. 10% aqueous NaOH, refluxed 1 h., and filtered, the filtrate added to 250 cc. concentrated HCl, the precipitate extracted with C6H6, and the extract evaporated yielded 3.66 g. IV, m. 102°. N-Bromosuccinimide (2.5 g.), 3.6 g. Bz2O2, 30 g. V, and 75 cc. CCl4 refluxed 3 h., cooled, filtered, and distilled gave 7 g. unchanged V and 26 g. oil, b0.03 122-42°, which, fractionally recrystallized from MeOH and petr. ether, gave 4 g. VI and 8 g. 4,2BrCH2(MeO)C6H3CO2Me (VIII), m. 51°. VIII (4 g.) and 3.2 g. (CH2)6N4 in 30 cc. CHCl3 refluxed I hr. and filtered, the residue refluxed 2 h. with 50 cc. AcOH and 50 cc. H2O, poured into H2O, and extracted with Et2O, and the extract worked up gave 1.5 g. oily 4,3-MeO2C(MeO)C6H3CHO; 2,4-dinitrophenylhydrazone m. 228-30° (C6H6). VIII (4 g.) in 100 cc. EtOH treated dropwise with stirring with 1.1 g. KCN in 50 cc. H2O, kept 4 h. at room temperature, refrigerated 14 h., diluted with saturated aqueous NaCl, and extracted with Et2O gave 1.77 g. 4,3-MeO2C(MeO)C6H3CH2CN, b0.3 149-50° m. 59-60°(EtOH). 4,2-Me(MeO)C6H3CO2H (20 g.) in 300 cc. dry CCl4 refluxed and irradiated as above with stirring, treated with a small amount powd. AlCl3 and a few cc. solution of 2.14 g. Br in 120 cc. CCl4, the mixture then treated dropwise during 17-20 h. with the remainder of the Br solution, kept overnight at room temperature, and several hrs. at 0°, and filtered yielded 15-16 g. 4,3-HO2C(MeO)C6H3CH2Br (IX), m. 124-5° (C6H6). IX (12 g.) stirred 3 h. at 0° with 110 cc. saturated HCl-MeOH, refrigerated overnight, diluted with ice, washed with Et2O, neutralized with solid NaHCO3, and extracted with Et2O gave 10 g. VIII, m. 51°. IX (500 mg.) and 500 mg. NaOAc in 5 cc. AcOH refluxed 2 h., diluted with H2O, and filtered yielded 330 mg. 4,3-HO2C(MeO)C6H3CHOAc, m. 100°. IX (5 g.) neutralized with 2N NaOH, treated gradually with 2 g. KCN, the mixture stirred 2 h. at room temperature, acidified, extracted with CHCl3, and the oily product chromatographed on silica gel yielded 64% 4,3-HO2C(MeO)C6H3CH2CN (X), m. 113-15° (C6H6-ligroine, b. 60-80°). X (1 g.) refluxed 2 h. with 10 cc. aqueous NaOH and 2 cc. EtOH, acidified, and filtered yielded 77% 4,3HO2C(MeO)C6H3CH2-CO2H (XI), m. 137.5-39° (Et2O-petr. ether). XI (1 g.), 2 cc. AcOH, and 2 cc. 48% HBr refluxed 1 h. and cooled gave 0.75 g. I (n = 1), m. 208-10° (H2O). 4,3-NC(O2N)C-6H3Me (XII) (10 g.) treated with Cl during 8.5 h. at 120-30° with irradiation with UV light, cooled, and filtered, and the residue triturated with cold EtOH gave 5 g. crude unreacted XII; the oily residue from the extract refluxed 2 h. with KOAc-AcOH, cooled, poured into H2O, extracted with Et2O, and the oily residue from the extract chromatographed on Al2O3 gave successively 10% oil, 43% unreacted XII, 5% oil, and 20% 4,3-NC(O2N)C6H3CH2OAc (XIII), m. 64-4.5°. XII (7 g.), 0.5 g. Bz2O2, and 45 cc. CCl4 refluxed 67 h. with 8 g. N-bromosuccinimide, filtered, and worked up, and the oily product (1.2 g.) refluxed 2 h. with KOAc-AcOH yielded 32% XIII, m. 64-5°. XII (25 g.) treated at 150° (later at 120-5°) with 3.3 g. Br with UV irradiation during 7 h. and extracted with Et2O, and the oily residue (32.5 g.) from the extract refluxed 2 h. with KOAc-AcOH yielded 25-30% XIII. Similarly were prepared the benzoate analog (XIV), m. 138-9.5° (C6H6), and the p-nitrobenzoate (XV) analog of XIII, m. 168.570° (CHCl3-C6H6). XIII, XIV, and XV treated overnight with an equivalent amount 50% aqueous KOH in 50-100 volume absolute EtOH at 0° yielded 80% 4,3-NC(O2N)C-6H3CH2OH, m. 78.5-80.5° (C6H6ligroine). 3,4-MeO(O2N)C-6H3Me (XVI) (1.8 g.) in 20 cc. CCl4 refluxed 4-5 h. with 4 cc. Br, bubbled with N, cooled, and filtered gave 2.1 g. 6,3,4-Br(MeO)-(O2N)C6H3Me. XVI (5 g.), 5.4 g. N-bromosuccinimide, and 0.3 g. Bz2O2 refluxed overnight in 30 cc. CCl4 (addnl. Bz2O2 was added after 4 h.) gave 58% 3,4-MeO(O2N)C6H3CH2Br (XVII), m. 97-820 (C6H6-ligroine). XVII (230 mg.), 230 mg. KOAc, and 5 cc. AcOH refluxed 1 h. yielded 175 mg. 3,4-MeO(O2N)C6-H3CH2OAc, m. 61-3° (C6-H6petr. ether). XVII (4 g.), 3.5 g. (CH2)-6N4, and 30 cc. CHCl3 refluxed 4 h., cooled, and filtered, and the residue (5.5-6.0 g.) refluxed 2 h. with 45 cc. AcOH and 45 cc. H2O, cooled, poured onto ice, and extracted with Et2O yielded 1.1-1.6 g. yellow 3,4-MeO-(O2N)C6H3CHO, m. 97-9° (EtOH); 2,4-dinitrophenylhydrazone m. 279-80° (EtOAc). X (1.05 g.) in 30 cc. Ac2O hydrogenated over 200 mg. PtO2, centrifuged, and evaporated, and the oily residue refluxed 4 h. with 2 cc. AcOH and 2 cc. 48% HBr and filtered gave 0.7 g. 4,2H2NCH2CH2(HO)C6-H3CO2H.HBr, m. 260° (absolute EtOH-Et2O). Hydrated Na2S (25.7 g.), 10.7 g. sulfur flowers, 23 g. KOH pellets, and 51 cc. H2O heated 15 min. on a water bath, added to 35 g. XVI in 260 cc. 95% EtOH, refluxed 4 h., steam distilled, and the distilled oil stirred several hrs. at 0° and filtered gave 13.6 g. 4,3-H2-N(MeO)C6H3CHO (XVIII), m. 100°; the gummy residue from the filtrate dissolved twice in saturated aqueous NaHSO3 and treated with 5N NaOH gave an addnl. 7.8 g. XVIII. XVIII (12 g.), 60 cc. AcOH, 10 cc. Ac2O, and 6 g. NaOAc refluxed 1.5 h., poured onto ice, saturated with Na2CO3, and filtered gave 15.3 g. 4,3-AcNH(MeO)C6H-3CHO (XIX), m. 142-5°. XIX (18.5 g.) in 23.5 cc. C5H5N, 10 g. CH2(CO-2H)2, and 1 cc. piperidine heated 5 h. on a water bath, cooled, poured onto 300 cc. ice and 30 cc. AcOH, and filtered yielded 75% 4,3-AcNH(MeO)C6H3CH:CHCO2H (XX), m. 213° (decomposition)(EtOH). XX (5.0 g.) in 30 cc. H2O shaken 1 h. with Na-Hg from 1.32 g. Na and 72 g. Hg, filtered, and acidified yielded 4.4 g. 4,3-AcNH(MeO)-C6H3CH2CH2CO-2H (XXI), m. 112° (H2O). XXI (6 g.) and 10 cc. solution of 8.8 g. KOH in 6.3 cc. H2O, diluted with MeOH to 25 cc., heated 1 h. on a water bath, treated with 5.5 cc. H2O, heated again 0.5 h., neutralized with HCl, and filtered gave 4.8 g. 4,3-H2N(MeO)C6H3CH2CH2CO2H (XXII), m. 98-9° (C6H6-ligroine). XXII (5 g.) neutralized with 2.7 g. Na2CO3 in 20 cc. H2O, treated with cooling with 2 g. NaNO2 in 10 cc. H2O, added with stirring and cooling to 10.5 cc. concentrated HCl and 10.5 cc. H2O at 6-8°, poured at 50-60° to a solution of CuCN from 6 g. CuSO4, 7.5 g.. KCN, and 30 cc. H2O, stirred 1 h. at 60-70°, filtered, acidified, and extracted with CHCl-3 yielded 2.9-3.15 g. 4,3-NC(MeO)C6H-3CH2CH2CO2H (XXIII), m. 159-60° (C6H6-ligroine). XXIII (0.5 g.), 1 cc. AcOH, and 1 cc. 48% HBr refluxed overnight and filtered gave 0.27 g. I (n = 2), m. 230° (decomposition) (EtOH). XVI (20 g.), 500 cc. H2O, and 45 g. KMnO4 refluxed until decolorized, treated during 6 h. at 0.5-h. intervals with 5-g. portions KMnO4, filtered hot, concentrated to 250 cc., and acidified with concentrated HCl gave 20-2 g. 3,4-MeO(O2N)C6H3CO2H (XXIV), m. 230.5°. XXIV (25 g.) and 50 cc. SOCl2 refluxed 4 h. and distilled yielded 22 g. 3,4-MeO(O2N)C6H3COCl (XXV), b1 150-60°, m. 50-5°. Mg (5.85 g.), 37 cc. absolute EtOH, and 1 cc. dry CCl4 treated with stirring with 37 cc. dry PhCl and then during 4 h. with coolingwith 26.4 cc. CH2(CO2Et)-2 and 18 cc. PhCl in 80 cc. absolute EtOH below 65°, heated slowly to 85°, kept about 2 h. at 85°, cooled to 25°, treated slowly with 32 g. XXV in 93 cc. PhCl with stirring below 35°, stirred 0.5 h. at 35°, and treated with cooling with 9.3 cc. H2SO4 > in 65 cc. H2O, the organic phase decanted, dried, and evaporated, and the residue refluxed 6 h. with 5 cc. AcOH, 6.5 cc. H2SO4, and 35 cc. H2O, cooled, and poured onto ice gave 19.5 g. 3,4-MeO(O2N)C6H3Ac (XXVI), m. 72-3° (ligroine); 15% unreacted XXV was recovered. XXVI (2 g.) in 5 cc. AcOH treated slowly with 1.64 g. Br in 5 cc. AcOH, diluted wi h H2O, and filtered yielded 2.5 g. 3,4-MeO(O2N)C6H3COCH2Br (XXVII), m. 90-1.5° (EtOH). NaH (250 mg.) and 3.1 cc. CH2(CO2Et)2 in 25 cc. HCONMe2 stirred until H evolution ceased, stirred an addnl. 0.5 h., treated with 2.74 g. XXVII in 30 cc. HCONM 2, stirred 23 h. at room temperature, evaporated in vacuo, and the residual oil triturated with a little Et2O gave 1.3 g. 3,4-MeO(O2N)C6H-3COCH2CH(CO2Et)2, m. 78-80° (EtOH), which upon acid or alk. hydrolysis gave only gummy products. EtO2CCHAcCH CO2Et (XXVIII)(15.5 g.) and 1.65 g. powd. Na in 105 cc. C6H6 refluxed 2 h., treated slowly with 15 g. 3,4-MeO(O2N)C6H3C ,Cl in 45 cc. C6H6, heated 1 h. on a water bath, kept 24 h., filtered, evaporated, the residue dissolved in 100 cc. Et2O, filtered, worked up, and the viscous oily product heated with occasional shaking on a water bath with 110 cc. 70 % H2SO4, cooled, filtered, and poured into ice gave 5.8 g. 3,4-MeO(O2N)C6H3CO-CH2CH-2CO2H (XXIX), m. 137-8.5° (H2O). XXVIII treated in the usual manner with 1 g. 3,4-MeO(O2N)C6H3COCl yielded 34% 3,4-MeO(O2N)C6H3COCAc(CO-2Me)CH2CO2Me, m. 99-100.5° (Et2O-petr. ether). XXIX (32.4 g.) in 145 cc. 2N NH4OH added at room temperature to 208 g. FeSO-4.5H2O in 340 cc. H2O, basified with 10% NH4OH, boiled a few min., filtered, concentrated to about 800 cc., adjusted with concentrated HCl to pH 6, and filtered gave 23 g. 4,3-H2N(MeO)C6-H3COCH2CH2CO2H (XXX), m. 152-3° (H2O). XXX (22.5 g.) and 10.3 g. Na2CO3 in 60 cc. H2O treated with stirring and cooling with 7.9 g. NaNO2 in 70 cc. H2O and then slowly with cold 52 cc. concentrated HCl and 52 cc. H2O below 4° added to CuCN solution from 23.4 g. CuSO4 and 29.3 g. KCN in 175 cc. H2O, heated 1 h. at 70° cooled, and acidified yielded 14.4 g. 4,3-NC(MeO)C6-H3COCH2CH2CO2H (XXXI), m. 153-4° (CHCl3). XXXI (14 g.), 104 cc. 10% aqueous NaOH, and 28 cc. 95% EtOH refluxed 2.5 h. under N, cooled, acidified with concentrated HCl, and extracted with CHCl3 yielded 10.6 g. 4,3-HO2C-(MeO)C6H3COCH2CH2CO2H (XXXII), m. 158-9.5° (CHCl3-ligroine). XXXII (10.6 g.), 60 cc.(HOCH2CH2)-2O, 8 g. KOH pellets, and 10 cc. 95% N2H4.H2O refluxed 2 h., distilled to 145-50° pot temperature, refluxed 5 h., cooled, acidified with concentrated HCl, extracted with CHCl3, and the crude oily product (6.7 g.) chromatographed on silica gel yielded 2.38 g. 4,3-HO2C(MeO)C-6H3(CH2)3CO2H (XXXIII), m. 110-12° (C6H6-ligroine). XXXIII (2.5 g.) heated 1 h. on a water bath with 5 cc. AcOH and 5 cc. 48% HBr yielded 1.1g. I(n = 3), m.205-° (H2O). XXXI (200 mg.), 0.4 cc. AcOH, and 0.4 cc. 48% HBr refluxed overnight gave 15 mg. 4,3-HO2C(HO)C6H3COCH2CH-2CO2H, m. 211-14° (H2O). The experimental process involved the reaction of 5-Bromo-2-methoxy-4-methylbenzoic acid(cas: 90326-61-7).HPLC of Formula: 90326-61-7
5-Bromo-2-methoxy-4-methylbenzoic acid(cas:90326-61-7) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. HPLC of Formula: 90326-61-7
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary