and alcohols with use of a copper catalyst and an amine base. The reaction is characterized by mild conditions, high selectivity, and tolerance with various functional groups. Facile transformation of imidates to amidines was also achieved by sodium cyanide. Additionally, a protocol for the extremely efficient Pd-catalyzed [3,3]-sigmatropic rearrangement of allylic sulfonimidates to N-allylic sulfonamides
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