Pyridinium 1,4-zwitterionic thiolates as a useful class of sulfur-containing synthons: application to the synthesis of 2,5-dihydro-1,4,5-thiadiazepines
作者:Bin Cheng、Yuntong Li、Taimin Wang、Xinping Zhang、Hui Li、Yun Li、Hongbin Zhai
DOI:10.1039/c9cc08326j
日期:——
A novel [4+3] cascade cyclization reaction of pyridinium 1,4-zwitterionic thiolates with azoalkenes derived from α-halo hydrazones in situ has been developed. This reaction was found to allow expedient access to an array of 2,5-dihydro-1,4,5-thiadiazepines. Libraries of highly functionalized sulfoxide and sulfone analogues of 2,5-dihydro-1,4,5-thiadiazepines were also obtained via selective oxidation
开发了一种新颖的[4 + 3]吡啶鎓1,4-两性离子硫醇盐与原位衍生自α-卤代azo的偶氮烯烃的级联环化反应。发现该反应允许方便地获得2,5-二氢-1,4,5-噻二氮杂品的阵列。还通过使用m-CPBA进行选择性氧化获得了2,5-二氢-1,4,5-噻二氮杂卓的高度官能化的亚砜和砜类似物的库。