<i>N-</i>Allyl-<i>N-</i>sulfonyl Ynamides as Synthetic Precursors to Amidines and Vinylogous Amidines. An Unexpected N-to-C 1,3-Sulfonyl Shift in Nitrile Synthesis
作者:Kyle A. DeKorver、Whitney L. Johnson、Yu Zhang、Richard P. Hsung、Huifang Dai、Jun Deng、Andrew G. Lohse、Yan-Shi Zhang
DOI:10.1021/jo200780x
日期:2011.6.17
N-allyl ynamides, which can also be accomplished thermally. An observation of N-to-C 1,3-sulfonyl shift was made when examining these aza-Claisen rearrangementsthermally. This represents a useful approach to nitrile synthesis. While attempts to render this 1,3-sulfonyl shift stereoselective failed, we uncovered another set of tandem sigmatropicrearrangements, leading to vinyl imidate formation. Collectively