(Z)-3-(α-烷氧羰基-α-氰基亚甲基)-2-氧-1,2,3,4-四氢喹喔啉3和(Z)-3-(α-烷氧羰基-α-氰基亚甲基)-3,4直接由二烷基(E)-2,3-二氰基丁二酸酯1与邻苯二胺(2)或2的反应以高收率制备具有各种烷氧羰基的-dihydrobenzo [ g ] quinoxalin-2(1 H)-ones 5分别为,3-二氨基萘(4)。此外,使2,3-二氨基吡啶(6)和3,4-二氨基吡啶(7)与二乙酯1b反应。得到(Z)-2-(α-氰基-α-乙氧基羰基亚甲基)-1,2-二氢-4 H-吡啶并[2,3 - b ]吡嗪-3-一(8)和(Z)-3- (α-氰基-α-乙氧基羰基亚甲基)-3,4-二氢-1 H-吡啶并[3,4- b ]吡嗪-2-酮(9)。的结构研究3,5,8,和9通过在一些细节NMR实验进行。
A Convenient Synthesis of (Z)-3- (a-Cyano-a-alkoxycarbonylmethylene)-2-piperazinones and Their Derivatives
作者:Yoichi Yamada、Heinosuke Yasuda、Masaaki Kasai
DOI:10.3987/com-99-8645
日期:——
(Z)-3-(alpha-Cyano-alpha-alkoxycarbonylmethylene)-2-piperazinone derivatives (3) and trans-(Z)-3-(alpha-cyano-alpha-alkoxycarbonylmethylene)-octahydro-2 (1H)-quinoxalinone derivatives (5) possessing various alkoxycarbonyl groups are prepared directly from the reaction of dialkyl (E)-2,3-dicyanobutenedioates (1) with ethylenediamine (2) and with trans-1,2-diaminocyclohexane (4), respectively. Furthermore, cis-1,2-diaminocycloheptane (6) and meso-2,3-diaminobutane (8) were reacted with the diethyl ester Ib to give cis-(Z)-3-(alpha-cyano-alpha-ethoxycarbonyl-methylene)decahydro-2H-cycloheptapyrazin-2-one (7) and cis-(Z)-3-(alpha-cyanoyano-alpha-ethoxycarbonylmethylene)-5,6-dimethyl-2-piperazinone (9), respectively. The structural studies of 3, 5, 7, and 9 were carried out by NMR experiments in some details.
A Simple Synthesis of 1-Substituted 5-Aminopyrazoles and Pyrazolo[1,5-a]-s-triazine Derivative
作者:Yoichi Yamada、Heinosuke Yasuda、Kazue Yoshizawa
DOI:10.3987/com-98-8262
日期:——
Dialkyl 5-amino-1-carbamoylpyrazole-3,4-dicarboxylates (3) and the l-aryl derivatives (5) are synthesized directly by the reaction of semicarbazide (2) or arylhydrazines (4) with dialkyl (E)-2,3-dicyanobutendioates (1) in the presence of organic salts, such as ammonium acetate or sodium acetate. Furthermore, the reaction of the 1,3-diamino compound (3; R= Et) with trimethyl orthoformate in acetic acid led to the formation of diethyl 7-hydroxypyrazolo[1,5-a]-s-triazine-2,3-dicarboxylate (6).
YAMADA, YOICHI;YASUDA, HEINOSUKE, SYNTHESIS (BRD),(1990) N, C. 768-770