Regioisomeric Formation of Acenaphtho[1,2-<i>e</i>][1,2,4]triazolo[3,4-<i>c</i>][1,2,4]triazines and Their Acyclic C-Nucleoside Analogues
作者:Nagwa Rashed、Mahmoud Shoukry、El Sayed H. El Ashry
DOI:10.1246/bcsj.67.149
日期:1994.1
The oxidative cyclization of the ethylidene derivative of 3-hydrazinoacenaphtho[1,2-e][1,2,4]triazine (2) gave regioselectively the angular isomer 1-methylacenaphtho[1,2-e][1,2,4]triazolo[3,4-c][1,2,4]triazine (5). Its linear isomer 10-methylacenaphtho[1,2-e][1,2,4]triazolo[4,3-b][1,2,4]triazine (4) was synthesized by the condensation of acenaphthenequinone (6) with 3,4-diamino-5-methyl-4H-1,2,4-triazole. Condensation of 2 with a number of monosaccharides afforded the respective hydrazones 9 whose oxidative cyclization gave the corresponding 1-(polyhydroxyalkyl)acenaphtho[1,2-e][1,2,4]triazolo[3,4-c][1,2,4]triazine (10). Acetylation of 9 and 10 gave 3-[N-acetyl-N′-(polyacetoxyalkylidene)hydrazino]acenaphtho[1,2-e][1,2,4]triazine (11) and 1-(polyacetoxyalkyl)acenaphtho[1,2-e][1,2,4]triazolo[3,4-c][1,2,4]triazine (13) respectively. Periodate oxidation of 9e gave 3-(2-oxoethylidenehydrazino)acenaphtho[1,2-e][1,2,4]triazine (14).
氧化环化3-肼基苊并[1,2-e][1,2,4]三嗪的乙叉衍生物(2),区域选择性地得到了角状异构体1-甲基苊并[1,2-e][1,2,4]三唑并[3,4-c][1,2,4]三嗪(5)。其线性异构体10-甲基苊并[1,2-e][1,2,4]三唑并[4,3-b][1,2,4]三嗪(4)通过苊醌(6)与3,4-二氨基-5-甲基-4H-1,2,4-三唑的缩合反应合成。(2)与多种单糖的缩合反应得到相应脎(9),其氧化环化反应得到了相应的1-(多羟基烷基)苊并[1,2-e][1,2,4]三唑并[3,4-c][1,2,4]三嗪(10)。(9)和(10)的乙酰化反应分别得到3-[N-乙酰基-N′-(多乙酸氧基亚烷基)肼基]苊并[1,2-e][1,2,4]三嗪(11)和1-(多乙酸氧基烷基)苊并[1,2-e][1,2,4]三唑并[3,4-c][1,2,4]三嗪(13)。(9e)的过碘酸氧化反应得到3-(2-氧代亚乙基肼基)苊并[1,2-e][1,2,4]三嗪(14)。