名称:
通过 1 的 [4+1] 型氧化闭环方便地合成 2,3-二氢-1,2,4-噻二唑、4,5-二氢-1,3-噻唑和 1,3-噻唑, 3-噻唑-1,3-丁二烯
摘要:
1,3-Thiaza-1,3-butadienes bearing an N,N-dimethylamino group at the C-2 position were efficiently converted into 5H-1,2,4-oxathiazoles, 2,3-dihydro-1,2,4-thiadiazoles, 4,5-dihydro-1,3-thiazoles, and 1,3-thiazoles through an oxidative ring closure by treating with mCPBA, chloramine-T, metal carbenoids, or dichlorocarbene, respectively, via the ring closure of in situ generated heterocumulene-type reactive species involving thione S-oxides, thione S-imides, and thiocarbonyl ylides.