[1,2,4]Triazines.<b>4</b>. Regiospecific ring closure reactions involving 6-amino-5-hydrazino[1,2,4]triazin-3(2<i>H</i>)-ones and orthoesters
作者:C. A. Lovelette、K. Geagan
DOI:10.1002/jhet.5570190618
日期:1982.11
6-Amino-5-hydrazino[1,2,4]triazin-3(2H)-one, 3, was treated with a variety of orthoesters and concentrated acid forming mixtures of ring-closed and open-chain derivatives. These mixtures were converted in warm aqueous acid to the Mriazolo[5,1-d][1,2,4]triazin-3(2H)-ones, 11b, 14b, and 15b by a regiospecific ring closure at N-4 of the [1,2,4]triazine ring and subsequent Dimroth-like rearrangement of
用各种原酸酯和浓酸形成闭环和开链衍生物的混合物处理6-氨基-5-肼基[1,2,4]三嗪-3(2 H)-one 3。通过在N-4处的区域特异性闭环,将这些混合物在温酸水溶液中转化为Mriazolo [5,1- d ] [1,2,4] triazin-3(2 H)-ones 11b,14b和15b。形成的s -triazolo [4,3- d ] [1,2,4] triazin-3(2 H)-one(11a, 14a,15a)。