Reactivity of substituted and unsubstituted diphenyephosphonium diylides towards carbonic anhydride derivatives.
作者:H.J. Cristau、M. Taillefer、J.P. Urbani、A. Fruchier
DOI:10.1016/0040-4020(95)01002-5
日期:1996.2
diphenylphosphonium diylides was investigated towards carbonic anhydride derivatives. Unsubstituted and substituted non-stabilized diylides react with phenylisocyanate and dicyclohexylcarbodiimide, leading to the formation of new monoylide type intermediates. These last ones react in situ with carbonyl compounds through a Wittig reaction leading respectively to α,β-unsaturated amides and amidines. Substituted semi-stabilized
研究了二苯基phosph二烷基化物对碳酸酐衍生物的反应性。未取代的和取代的未稳定的二亚烷基酯与异氰酸苯酯和二环己基碳二亚胺反应,导致形成新的单内酯型中间体。这些最后一个通过Wittig反应与羰基化合物原位反应,分别导致α,β-不饱和酰胺和am。在类似条件下,取代的半稳定或稳定的二亚烷基导致形成烯烃。在所有情况下,观察到通过1 H-NMR和13 C-NMR测定的高E立体选择性。