Efficient Syntheses of ω-Chloro-, ω-Imido- and ω-Aminoalkyl-1,2,4-triazoles fromN-Acyl-formamidinium Salts orN-Acylformamides and Hydrazines
作者:Ute Bechstein、Andrea Rumler、Jürgen Liebscher
DOI:10.1002/ardp.19923250813
日期:——
are transformed to ω‐functionalized N‐acylformamidinium salts 4 or formamide 6a by HCI catalyzed addition of chloromethylene iminium salts, derived from formamides 2 and POCI3. Advantageously, β‐halo‐propionyl‐formamidiniumsalts 4 can also be obtained from acrylonitrile. Regiospecific and chemoselective cyclization of N‐acyl‐formamidiniumsalts 4 or formamide 6a to ω‐functionalized 5‐alkyl‐1,2,4‐triazoles