作者:David M. Hodgson、Andrew Charlton、Robert S. Paton、Amber L. Thompson
DOI:10.1021/jo3025972
日期:2013.2.15
The synthesis and alkylation of chiral, nonracemic tropane- and homotropane-derived enamines is examined as an approach to enantioenriched α-alkylated aldehydes. The two bicyclic N auxiliaries, which differ by a single methylene group, give opposite senses of asymmetric induction on alkylation with EtI and provide modestly enantioenriched 2-ethylhexanal (following hydrolysis of the alkylated iminium)
作为一种对映体富集的α-烷基化醛的方法,研究了手性,非外消旋的托烷和高托烷衍生的烯胺的合成和烷基化。这两个双环N助剂的区别在于单个亚甲基,它们在用EtI烷基化时产生相反的不对称诱导感,并提供适度对映体富集的2-乙基己醛(在烷基化的亚胺水解后)。两种烯胺的乙基化密度泛函研究支持了观察到的立体选择性。