N-Tosylimidates in highly enantioselective organocatalytic Michael reactions
作者:Antonio Massa、Naoto Utsumi、Carlos F. Barbas
DOI:10.1016/j.tetlet.2008.10.126
日期:2009.1
N-Tosylimidates acted as nucleophiles in highlyenantioselectiveorganocatalytic Michael addition reactions to α,β-unsaturated aldehydes in the presence of a catalytic amount of trialkylsilyl-protected diarylprolinol. In particular, α-phenyl-substituted N-tosylimidates showed good reactivity. We also demonstrate that the kinetic acidity of the α-proton of α-phenyl N-tosylimidate as measured by proton/deuterium