Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: (S)-3,3′-Dibromo-1,1′-bi-2-naphthol, is researched, Molecular C20H12Br2O2, CAS is 119707-74-3, about Catalytic enantioselective trapping of an alcoholic oxonium ylide with aldehydes: RhII/ZrIV-Co-catalyzed three-component reactions of aryl diazoacetates, benzyl alcohol, and aldehydes.Application In Synthesis of (S)-3,3′-Dibromo-1,1′-bi-2-naphthol.
A catalytic asym. multicomponent reaction has been developed in which two stereogenic carbon centers are constructed in a single step. This type of enantioselective three-component reaction generates α,β-dihydroxy acid derivatives, e.g. (2S,3S)-PhCH(OH)CPh(OBn)CO2Me, in good yields and with excellent enantioselectivities.
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Reference:
Bromide – Wikipedia,
bromide – Wiktionary