Saturated heterocycles, part 161 [1]. Synthesis of 2‐hydroxycycloalkyl‐substituted 1,3,4‐oxadiazoles, 1,3,4‐thiadiazoles and 1,2,4‐triazoles

A number of 2‐hydroxycycloalkyl‐substituted 1,3,4‐oxadiazole, 1,3,4‐thiadiazole and 1,2,4‐triazole derivatives were prepared by different methods from cis‐ and trans‐2‐hydroxy‐1‐cycloalkanecarbohydrazides and their isocyanate or isothiocyanate adducts. In contrast with the related ring‐closure reactions of 2‐aminobenzoylhydrazides, no condensed skeleton heterocycles were formed in this case.