Transformation of Alkyl<i>N</i>-(Vinyloxy)benzimidates to Alkyloxazoles. Mechanism and Extension
作者:Masataka Yokoyama、Yasuhiro Menjo、Makoto Ubukata、Masakazu Irie、Mikari Watanabe、Hideo Togo
DOI:10.1246/bcsj.67.2219
日期:1994.8
Transformation of alkyl N-(vinyloxy)benzimidates to alkyloxazoles proceeds through the intermediates: a charge-separated 1,2-oxazetidine derivative and then 1-hydroxy-2-[[methylthio(phenyl)methylene]imino]maleic acid diester, while their photochemical transformation takes place via a concerted [1,3] sigmatropic shift. As the extension of this reaction, the preparation of the precursor proposed for
N-(乙烯基氧基)苯甲酸烷基酯通过中间体转化为烷基恶唑:电荷分离的 1,2-氧氮杂环丁烷衍生物,然后是 1-羟基-2-[[甲硫基(苯基)亚甲基]亚氨基]马来酸二酯,而它们的光化学转化通过一致的 [1,3] σ 位移发生。作为该反应的延伸,描述了维吉尼亚霉素 M2 合成前体的制备和 N-(乙烯基氧基) 苯甲亚胺酸烷基酯的 N-类似物的反应。