Deprotonation of β,β-disubstituted α,β-unsaturated amides - Mechanism and stereochemical consequences
作者:James R Green、Marek Majewski、Victor Snieckus
DOI:10.1139/v06-112
日期:2006.10.1
detailed study of the lithium dialkylamide induced deprotonation of β,β-disubstituted α,β-unsaturated amides is presented. The preferential γ-Z-deprotonation and stereochemical outcome of substituents on the γ-Z carbon atom are rationalized in terms of a cyclic eight-membered transition state, which is supported by DFT calculations. Analogous deprotonations on cyclohexylidenecarboxamides reveal a delicate