Formation of 2,5-dihydro-2-iminopyrroles, 2,5-dihydro-2-iminofurans and (Z)-3-alkylamino-2,3-dicyanoacrylatesvia4-chloro-5H-1,2,3-dithiazol-5-ylidene derivatives
摘要:
Treatment of 4-chloro-5H-1,2,3-dithiazol-5-ylidene derivatives 1-3 with primary and secondary alkylamines in CH2Cl2 at room temperature gave 2,5-dihydro-2-iminopyrroles (22-55%) and 2,5-dihydro-2-iminofurans (18-62%). However similar treatment of alkyl (4-chloro-5H-1,2,3-dithiazol-5-ylidene)cyanoacetates under the same conditions gave (Z)-3-alkylamino-2,3-dicyanoacrylate esters (39-72%). (C) 1998 Elsevier Science Ltd. All rights reserved.