A Base‐Controlled Reaction of 2‐Cyanoacetamidines (3,3‐Diaminoacrylonitriles) with Sulfonyl Azides as a Route to Nonaromatic 4‐Methylene‐1,2,3‐triazole‐5‐imines
作者:Pavel S. Silaichev、Tetyana V. Beryozkina、Mikhail S. Novikov、Wim Dehaen、Vasiliy A. Bakulev
DOI:10.1002/ejoc.202000453
日期:2020.6.30
disproved by this study. Thus, the reaction of 2‐cyanoacetamidines with sulfonyl azides afforded different types of 1,2,3‐triazoles. Mesyl azide reacts with 2‐cyanoacetamidines in the absence of a base to afford 5‐amino‐4‐cyano‐1,2,3‐triazole. The use of a strong base switches the direction of the reaction in favor of nonaromatic 4‐methylene‐1,2,3‐triazole‐5‐imines.
这项研究已证实了对亚甲基活性am与磺酰叠氮化物的单重氮基转移方向的普遍接受的观点。因此,2-氰基乙am与磺酰基叠氮化物的反应提供了不同类型的1,2,3-三唑。甲基叠氮化物在不存在碱的情况下与2-氰基乙am反应生成5-氨基-4-氰基1,2,3-三唑。使用强碱会改变反应方向,而转向非芳香族4-亚甲基-1,2,3-三唑-5-亚胺。