Process for the manufacture of epoxy triazole derivatives

Details Process for the manufacture of epoxy triazole derivatives Process for the manufacture of epoxy triazole derivatives

2010-08-31

2011-12-13

Chu, Yong (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S425000, C568S308000, C560S126000, C556S482000

Reexamination Certificate

active

08076494

ABSTRACT:
Disclosed is a process for the manufacture of a compound of formula (I)wherein Hal represents fluoro or chloro, and R1and R2represent, independently from one another, hydrogen or Hal; in which process a compound of formula (II)is converted to a corresponding alkyl, fluoroalkyl or aryl sulfonic acid ester, which is then reacted with an alkali metal nitrite in the presence of a suitable crown ether in a polar non-nucleophilic solvent at a temperature of −10 to 50° C. to give the compound of formula (I).

REFERENCES:
patent: WO 9945008 (1999-09-01), None
Tasaka, et al., Chem. Pharm. Bull. 41:1035 (1993).

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