作者:Peter J. Duggan、Andris J. Liepa、Laura K. O'Dea、C. Elisabet Tranberg
DOI:10.1039/b615569c
日期:——
5-amino-1,1-dioxo-[1,2,4,6]-thiatriazines and. Initial alkylation of the thiatriazole with alpha-halo-esters at N-3 produces alpha-substituted esters which, under basic reaction conditions, undergo opening of the thiatriazole ring and re-closure to a thiatriazine ring. Similar alkylations of with diethyl chloromalonate and ethyl dichloroacetate lead to the loss of SO2 and the production of triazine and
已经确定了4-氨基-1,1-二氧代-[1,2,3,5]-噻三唑的不寻常的扩环反应,该反应产生了相对罕见的5-氨基-1,1-二氧代-[1,2 ,4,6]-噻三嗪和。噻三唑在N-3处用α-卤代酯进行的初始烷基化反应会产生α-取代的酯,在碱性反应条件下,该化合物会打开噻三唑环并重新闭合为噻三嗪环。用氯丙二酸二乙酯和二氯乙酸乙酯进行类似的烷基化反应会导致SO2的损失以及三嗪和三唑的产生,这显然是由于在N-5处发生了初始烷基化。与苯甲酰溴或苯甲酰二溴的反应形成完全不饱和的5-氨基-1,1-二氧代-[1,2,4,6]-噻三嗪。