Reaction of the N-acyliminium ion precursor 1a (derived from S-proline via anodic methoxylation) with RCu in the presence of BF3·Et2O gives preferentially the trans adducts 2 (trans:cis ≥96:4). Using such a procedure, a general synthetic route to (2R, 5R)-trans-2,5-dialkylpyrrolidines has been developed, as exemplified by the chirospecific syntheses of the ant feromones trans 5-butyl-2-heptylpyrrolidine
在BF 3 ·Et 2 O的存在下,N-酰基
亚胺离子前体1a(通过S-脯
氨酸通过阳极甲氧基化反应)与RCu反应,优先得到反式加合物2(trans:cis≥96:4)。使用这样的方法,已经开发了合成(2R,5R)-反式-2,5-二烷基
吡咯烷酮的一般方法,例如反式5-丁基-2-庚基
吡咯烷酮(10a),反式
铁蚁的手性特异性合成就是例证。-5-乙基-2-庚基
吡咯烷(10b)和反-5-庚基-2-(5-己烯基)
吡咯烷(10c)。