A convenient procedure for the preparation of sulfonamidoureas using triphosgene
An efficient method for the preparation of sulfonamidourea using triphosgene in organic solvents is reported. Sulfonylhydrazides and acetylsulfanilylhydrazide were transformed into the corresponding intermediates using triphosgene in 1,4-dioxane/water or tetrahydrofuran as solvents. These intermediates were converted in situ into symmetrical and unsymmetrical sulfonamidoureas in high yields and shorter periods of time related to previous methods.
An efficient synthesis of sulfonylhydrazides and sulfonylsemicarbazides by utilizing alumina as a catalyst
Sulfonyl hydrazides and sulfonyl semicarbazides are readily prepared by the reacting of hydrazine derivatives with sulfonyl chlorides in the presence of basic alumina under solvent-free conditions. Reaction of a sulfonyl chloride with t-butylcarbazate, followed by hydrolysis provides the corresponding sulfonyl hydrazides in higher yield and shorter time than previously reported.
Safaei-Ghomi, Javad
p. 1561 - 1563
(2008/09/16)
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