The first asymmetricorganocatalyticallylicalkylation of 1,2-dihydro-Reissert compounds and Morita–Baylis–Hillman (MBH) carbonates has been developed, which provided a novel protocol to construct enantioenriched functionalized 1,2-dihydroisoquinolines bearing vicinal quaternary and tertiary chiral centers at C-1 position (up to 94% ee, dr > 20 : 1).
Enantioselective Alkylation of Reissert Compounds in Phase Transfer Catalysed Reactions
作者:Maria D. Rozwadowska、Danuta Brózda、Krzysztof Hoffman
DOI:10.3987/com-05-s(t)35
日期:——
IsoquinolineReissertcompounds were alkylated under phase-transfer reaction conditions using chiral quaternary ammonium salts derived from Cinchona alkaloids as catalysts. The best stereoselectivity (ee up to 65%) was achieved in the alkylation of 1-cyano-2-phenoxycarbonyl-1.2-dihydroisoquinoline (1d), catalysed by N-benzylcynchoninium bromide (3a), carried in toluene/50% NaOH biphasic system.