Studies on heterocyclic enaminonitriles. VII. Reactions of 2-amino-3-cyano-4,5-dihydrothiophenes with acetylenic esters.
作者:HISASHI MATSUNAGA、MIKI SONODA、YUKIHIKO TOMIOKA、MOTOYOSHI YAMAZAKI
DOI:10.1248/cpb.34.396
日期:——
The reactions of 2-amino-3-cyano-4, 5-dihydrothiophene (Ia) and 2-amino-3-cyano-5-methyl-(or 4-phenyl)-4, 5-dihydrothiophene (Ib or Ic) with dimethyl acetylenedicarboxylate (DMAD) or methyl propiolate in dimethyl sulfoxide (DMSO) or hexamethylphosphoric triamide gave the corresponding dimethyl(or methyl) 2-amino-5-cyano-6, 7-dihydrothiepin-3, 4-dicarboxylate(or 3-carboxylate) (IIa-c or IVa-c). Compounds Ia-c reacted with DMAD in refluxing xylene to give the corresponding dimethyl α-(3-cyano-4, 5-dihydro-2-thienylamino)fumarates (IIIa-c).
2-amino-3-cyano-4, 5-dihydrothiophene (Ia)和 2-amino-3-cyano-5-methyl-(or 4-phenyl)-4、在二甲基亚砜(DMSO)或六甲基三磷酰胺中,将 2-氨基-5-氰基-6, 7-二氢噻吩(Ib 或 Ic)与乙酰二羧酸二甲酯(DMAD)或丙炔酸甲酯反应,可得到相应的 2-氨基-5-氰基-6, 7-二氢噻吩-3, 4-二羧酸盐(或 3-羧酸盐)(IIa-c 或 IVa-c)二甲酯(或甲基)。化合物 Ia-c 与 DMAD 在回流二甲苯中反应,得到相应的 α-(3-氰基-4, 5-二氢-2-噻吩氨基)富马酸二甲酯 (IIIa-c)。