Process for preparing 3-chloromethyl-1,2,4-triazolin-5-one

Details Process for preparing 3-chloromethyl-1,2,4-triazolin-5-one Process for preparing 3-chloromethyl-1,2,4-triazolin-5-one

2007-06-26

2007-06-26

Balasubramanian, Venkataraman (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C564S034000

Reexamination Certificate

active

10524866

ABSTRACT:
The present invention is directed to processes for the preparation of 3-chloromethyl-1,2,4-triazolin-5-one. This compound is useful as an intermediate in the synthesis of compounds which possess pharmacological activity. Also disclosed are novel semicarbazide salts and the preparation thereof, which are intermediates for the preparation of 3-chloromethyl-1,2,4-triazolin-5-one.

REFERENCES:
patent: 2749217 (1956-06-01), Deutschman, Jr.
patent: 6297376 (2001-10-01), Cottrell et al.
patent: 6407255 (2002-06-01), Cottrell et al.
patent: WO 99/65900 (1999-12-01), None
patent: WO 01/96315 (2001-06-01), None
Journal of the American Chemical Society, 41, 393 (1919) “The Relations Between The Chemical Structures of Carbonyl Derivatives and Their Reactivities Toward Salts of Semicarbazide”.
Journal of the American Chemical Society, 52, 1250 (1930) “The Preparation of Semicarbazide”.
Tetrahedron Letters, 41 (2000) 8661-8664 “A New Synthesis of 1,2,4-triazolin-5-ones: application to the convergent synthesis of a NKI antagonist”.

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