Unexpected Behavior of Enaminones: Interesting New Routes to 1,6-Naphthyridines, 2-Oxopyrrolidines and Pyrano[4,3,2-de][1,6]naphthyridines
作者:Moustafa Moustafa、Saleh Al-Mousawi、Noha Hilmy、Yehia Ibrahim、Johannes Liermann、Herbert Meier、Mohamed Elnagdi
DOI:10.3390/molecules18010276
日期:——
Reaction of enaminones 1a–d with 2-aminoprop-1-ene-1,1,3-tricarbonitrile (2) in the presence of AcOH/NH4OAc afforded 7-amino-5-oxo-5,6-dihydro-1,6-naphthyridine-8-carbonitrile derivatives 9a–d. On the other hand, 2-aminopyrano[4,3,2-de] [1,6]naphthyridine-3-carbonitriles 20a–c,e were the only obtained products from the reactions of 1a–d with 2 in the presence of AcOH/NaOAc, while 1d afforded [3,5-bis-(4-chloro-benzoyl)-phenyl]-(4-chloro-phenyl)-methanone 21 under the same condition. The reaction of 2 with diethyl acetylenedicarboxylate in the presence of AcOH/NH4OAc afforded (4-cyano-5-dicyanomethylene-2-oxo-2,5-dihydro-1H-pyrrol-3-yl)-acetic acid ethyl ester 15B.
在AcOH/NH4OAc的存在下,enaminones 1a–d与2-氨基丙-1-烯-1,1,3-三氰基化合物(2)反应生成了7-氨基-5-氧-5,6-二氢-1,6-萘啶-8-氰基衍生物9a–d。另一方面,在AcOH/NaOAc的存在下,1a–d与2的反应仅得到2-氨基吡喃[4,3,2-de][1,6]萘啶-3-氰基化合物20a–c,e,而1d在相同条件下生成了[3,5-双-(4-氯苯甲酰)-苯基]-(4-氯苯基)-甲酮21。2与二乙基乙炔二羧酸酯在AcOH/NH4OAc的存在下反应生成了(4-氰-5-二氰基亚甲基-2-氧-2,5-二氢-1H-吡咯-3-基)-乙酸乙酯15B。