Process for the synthesis of Losartan potassium

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...

Reexamination Certificate

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C548S252000

Reexamination Certificate

active

10913121

ABSTRACT:
Improved processes using primary, secondary and tertiary alcohols and with safer mode of introduction of the reagent and reaction conditions are described. Further, the process of manufacture of Losartan potassium by use of alkali metal salt such as Potassium carbonate is disclosed. A process for preparation of the polymorphic Form I of Losartan potassium is also disclosed herein.

REFERENCES:
patent: 5138069 (1992-08-01), Carini et al.
patent: 5281603 (1994-01-01), Venkatesan et al.
patent: 5281604 (1994-01-01), Levin et al.
patent: 5608075 (1997-03-01), Campbell, Jr. et al.
patent: WO 93/10106 (1993-05-01), None
patent: WO 95/17396 (1995-06-01), None
patent: WO 98/18787 (1998-05-01), None
patent: WO 01/81336 (2001-11-01), None
patent: WO 02/094816 (2002-11-01), None
patent: WO 03/048135 (2003-06-01), None
patent: WO 03/093262 (2003-11-01), None
Burrell, Drug Safety, (1997), vol. 16(1), pp. 56-65.

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