Switching and Conformational Fixation of Amides Through Proximate Positive Charges
作者:Amelie L. Bartuschat、Karina Wicht、Markus R. Heinrich
DOI:10.1002/anie.201502474
日期:2015.8.24
Tertiary amides, which usually occur as cis/trans mixtures, can be effectively shifted to the cis conformation by placing a positive charge in close proximity to the amide carbonyl. This effect was used to prepare cis‐configured prolyl amides and to facilitate a strongly rotamer‐dependent radical cyclization.