Type 2 Intramolecular <i>N</i>-Acylazo Diels−Alder Reaction: Regio- and Stereoselective Synthesis of Bridgehead Bicyclic 1,2-Diazines
作者:Claudia L. Molina、Chun P. Chow、Kenneth J. Shea
DOI:10.1021/jo070978f
日期:2007.8.31
The type 2 intramolecular N-acylazo Diels−Alder reaction provides a regio- and stereoselective synthesis of bicyclic 1,2-diazine systems. A new method for the generation of N-acylazo dienophiles with tetra-n-butylammonium periodate is reported. X-ray crystallographic analysis allowed the quantification of structural distortions of the nonplanar bridgehead olefin and lactam functionalities in 1,2-diazine
2型分子内N-酰基丙二酸Diels-Alder反应提供了双环1,2-二嗪系统的区域和立体选择性合成。报道了一种新的用高碘酸四正丁铵酯生成N-酰基偶氮二烯的方法。X射线晶体学分析可以量化1,2-二嗪环加合物11和15中非平面桥头烯烃和内酰胺官能团的结构变形。己内酰胺和对映内酰胺是通过立体选择性桥头烯还原反应形成的,该过程将立体化学从桥头内酰胺氮转移到桥头碳上。转化顺序为中环氮杂环和1,4-二胺的非对映选择性合成提供了一条便利的途径。