Process for the production of the form I of the anhydrous terazo

Details Process for the production of the form I of the anhydrous terazo Process for the production of the form I of the anhydrous terazo

1997-10-20

1999-01-12

Gupta, Yogendra N.

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

544284, 544295, C07D23984

Patent

active

058592458

ABSTRACT:
The process for the production of form I of anhydrous terazosin monohydrochloride consists of heating terazosin suspended in a mixture made by methanol and a solvent selected from C.sub.2 to C.sub.6, straight or branched alcohols, esters of C.sub.1 -C.sub.8 aliphatic carboxylic acids with straight or branched C.sub.1 to C.sub.8 alcohols, C.sub.3 to C.sub.8 aliphatic ketones, C.sub.4 to C.sub.8 straight branched or cyclic aliphatic ethers, aliphatic amides and aliphatic nitriles with a methanol solution of hydrochloric acid.

REFERENCES:
patent: 4026894 (1977-05-01), Winn et al.
patent: 4251532 (1981-02-01), Roteman
patent: 5212176 (1993-05-01), Kyncl et al.
patent: 5294615 (1994-03-01), Meyer et al.
patent: 5412095 (1995-05-01), Morley et al.

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