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Synthesis 2007(12): 1779-1784
DOI: 10.1055/s-2007-983714
DOI: 10.1055/s-2007-983714
PAPER
© Georg Thieme Verlag Stuttgart · New York
A Novel Synthesis of 2,5-Disubstituted 1,3,4-Oxadiazolines by the Regioselective Cyclization of 1,4-Disubstituted Thiosemicarbazides
Further Information
Publication History
Received
31 January 2007
Publication Date:
08 June 2007 (online)


Abstract
A novel and efficient route for the regioselective synthesis of 5-aryl-2-[(4-aryl-2-oxo-1,3,2-dioxaphosphinan-2-yl)imino]-2,3-dihydro-1,3,4-oxadiazoles in high yield and purity by the desulfurization and cyclization of 1-benzoyl-4-[(4-aryl-2-oxo-1,3,2-dioxaphosphinan-2-yl)thiosemicarbazides under mild conditions is reported. The products are isolated as the trans-isomer only.
Key words
oxadiazole - thiosemicarbazide - regioselective - cyclization - desulfurization