Process for producing a 1H-pyrazolo[5,1-C]-1,2,4-triazole compou

Details Process for producing a 1H-pyrazolo[5,1-C]-1,2,4-triazole compou Process for producing a 1H-pyrazolo[5,1-C]-1,2,4-triazole compou

1992-07-23

1994-02-08

Morris, Patricia L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546271, C07D48704

Patent

active

052849589

ABSTRACT:
There are disclosed processes of producing a 1H-pyrazolo[5,1-c]-1,2,4-triazole compound by (1) the ring-formation reaction of 5-hydrazino-1H-pyrazole with a carboxylic acid and by (2) the ring-closure reaction of a 5-acylhydrazino-1H-pyrazole, wherein both the reactions are carried out in the presence of a phosfolan compound or phosphonium salt formed from a tertiary phosphine and a halogenating agent. The disclosure described provides a method of producing a 1H-pyrazolo[5,1-c]-1,2,4-triazole compound that can be carried out efficiently in one step in simplified process with improved yield compared with the prior process.

REFERENCES:
patent: 3725067 (1973-04-01), Bailey et al.
patent: 5214149 (1993-05-01), Mizukawa

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