New Heterocycles from the Reaction between Some Natural α-Amino Acid Hydrazides and Formaldehyde
作者:Giancarlo Verardo、Nicoletta Toniutti、Andrea Gorassini、Angelo G. Giumanini
DOI:10.1002/(sici)1099-0690(199911)1999:11<2943::aid-ejoc2943>3.0.co;2-x
日期:1999.11
The ring forming condensation between some natural α-amino acid phenylhydrazides (1) and aqueous formaldehyde (2) has opened a novel synthetic route to hexahydro-1,2,4-triazin-6-one derivatives (3). Polycyclic systems were obtained from the same reaction carried out with L-aspartic acid 1,4-bis(2-phenylhydrazide) (1d), L-histidine phenylhydrazide (1e) and L-tryptophan phenylhydrazide (1f) which gave
一些天然 α-氨基酸苯酰肼 (1) 与甲醛水溶液 (2) 之间的成环缩合为六氢-1,2,4-triazin-6-one 衍生物 (3) 开辟了一条新的合成路线。从与 L-天冬氨酸 1,4-双 (2-苯酰肼) (1d)、L-组氨酸苯酰肼 (1e) 和 L-色氨酸苯酰肼 (1f) 进行的相同反应获得多环系统,得到 perhydro-4, 6-dioxo-2,8-diphenyl[1,2,4]triazino[4,5-d][1,2,4]trizepine (5) perhydro-1-oxo-3-phenylimidazo[5,4-d ][1,2,4] 三嗪基 [4,5-a] 吡啶 (7) 和 1,2,3-H-3-(2-苯基咔唑酰基)-β-咔啉 (8),分别。通过苯肼与保留原始手性的 L-α-氨基酸酯的直接反应,可以方便地获得底物 1。