Fused polycyclic nitrogen-containing heterocycles 20. Thiazolo[3,4-a]quinoxalines from 4-hydroxy-2-phenyliminothiazolidines and C-substituted 1,2-phenylenediamines
作者:V. A. Mamedov、N. A. Zhukova、T. N. Beschastnova、A. T. Gubaidullin、Ya. A. Levin、I. A. Litvinov
DOI:10.1007/s11172-009-0029-z
日期:2009.1
The condensation of 4-hydroxy-3,5-diphenyl-2-phenyliminothiazolidine with 4,5-dimethyl-1,2-phenylenediamine affords 7,8-dimethyl-3-phenyl-1-phenyliminothiazolo[3,4-a]quinox-alin-4(5 H)- one; the condensation with 1,2-phenylenediamines containing different substituents at positions 4 and 5 gives both theoretically possible isomeric thiazolo[3,4-a]quinoxalines, which differ in the distribution of these substituents between positions 7 and 8 in the benzene ring of the quinoxaline system. 3a-Hydroxy-7,8-dimethyl-3-phenyl-l-phenylimino-3,3a-di-hydrothiazolo[3,4-a]quinoxalin4(5 H)- one was isolated and characterized as the intermediate of the reaction giving rise to thiazolo[3,4-a]quinoxaline from 4,5-dimethyl-1,2-phenylene-diamine. This intermediate is a covalent hydrate of the final product.
4- 羟基-3,5-二苯基-2-苯基亚氨基噻唑烷与 4,5-二甲基-1,2-苯二胺缩合生成 7,8-二甲基-3-苯基-1-苯基亚氨基噻唑并[3,4-a]喹喔啉-4(5 H)- 1;与在第 4 位和第 5 位含有不同取代基的 1,2-苯二胺缩合,可得到两种理论上可能的异构体噻唑并[3,4-a]喹喔啉,它们在喹喔啉系统苯环的第 7 位和第 8 位之间的取代基分布不同。3a- 羟基-7,8-二甲基-3-苯基-l-苯基亚氨基-3,3a-二氢噻唑并[3,4-a]喹喔啉-4(5 H)- 1 被分离出来并表征为从 4,5-二甲基-1,2-苯二胺生成噻唑并[3,4-a]喹喔啉反应的中间体。该中间体是最终产物的共价水合物。