Understanding α,β-Unsaturated Imine Formation from Amine Additions to α,β-Unsaturated Aldehydes and Ketones: An Analytical and Theoretical Investigation
作者:Adam D. J. Calow、Jorge J. Carbó、Jessica Cid、Elena Fernández、Andrew Whiting
DOI:10.1021/jo5007366
日期:2014.6.6
and DFT calculations have been used to understand what factors govern the selectivity in the addition of primary amines to α,β-unsaturated aldehydes and ketones, i.e., 1,2- versus 1,4-addition. It has been found that the 1,2-addition products (α,β-unsaturated imines following addition and elimination) usually predominate for most systems. However, exceptions, such as methyl vinyl ketone, selectively give
结合使用原位红外光谱(ReactIR)和DFT计算来了解哪些因素决定了将伯胺添加到α,β-不饱和醛和酮中的选择性,即1,2-对1,4-添加。已经发现,在大多数系统中,1,2-加成产物(加成和消除后的α,β-不饱和亚胺)通常占主导地位。但是,诸如甲基乙烯基酮之类的例外情况会选择性地产生1,4-加成产物。这已通过DFT计算得到了合理化,该计算表明涉及主要构象效应,主要受羰基取代基的空间效应控制,从而形成了一种模型,该模型提供了简单,可预测的α,β-不饱和亚胺制备方法,可用于原位合成。