Reaction of<i>N,N</i>'-dimethyl-2-nitroethene-1, 1-diamine with α,ß-unsaturated acyl isothiocyanates: Preparation of 1,3-thiazin-4-one and 4-nitro-1,2-thiazol-5(2<i>H</i>)-imine derivatives
作者:María I. García Trimiño、Arturo Macías Hermán Vélez Cabrera Castro、Arístides Rosado Pérez、Dally Moya Argilagos、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.19980810321
日期:——
The reaction of N,N'-dimethyl-2-nitroethene-1,1-diamine (8) with α,ß-unsaturated acyl isothiocyanates 9 affords 3,3-diamino-2-nitroacrylthioamides 10 (Scheme 2) in moderate-to-good yields. Cyclization of 10 under acidic conditions gives 1,3-thiazin-4-one derivatives of type 11. Oxidative cyclization of 10 with diethyl azodicaboxylate leads to 4-nitro-1,2-thiazol-5(2H)-imine derivatives 12.
的反应N, “ -二甲基-2-硝基乙烯-1,1-二胺(8)与α,β-不饱和酰基异硫氰酸酯9次,得到3,3-二氨基-2- nitroacrylthioamides 10(方案2)在中度至-良率。10在酸性条件下的环化反应生成11型的1,3-噻嗪-4-酮衍生物。10与二乙基偶氮二甲氧基化物的氧化环化导致4-硝基-1,2-噻唑-5(2 H)-亚胺衍生物12。