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(11)    Patent No :    AP 2757   
(21)    Application No :    AP/P/2008/004641   
(22)    Filing Date :    29.03.2007   
(24)    Date of Grant &    19.09.2013   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
US    60/787,126    29.03.2006
(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW
(73) Applicant(s)

GILEAD SCIENCES, INC., 333 Lakeside Drive, Foster City,

CA 94404,
United States of America
(72) Inventors

CRAWFORD Kenneth R, United States of America

DOWDY Eric D, United States of America

GUTIERREZ Arnold, United States of America

et al
(74) Representative

HONEY & BLANCKENBERG
(51)  International  Classification   C07D 493/04 (2006.01)    C07F 9/02 (2006.01)
C07C 327/42 (2006.01)   
(54)    Title

Process for preparation of HIV protease inhibitors

(57)    Abstract

A process for the synthesis of bisfuran intermediates of formula (0) useful for preparing antiviral HIV protease inhibitor compounds is hereby disclosed. Furthermore disclosed is a HIV protease inhibitor of formula (IV) as well as various intermediates thereof.

(56)    Documents Cited :    WO 2005/042772 A    WO 02/067239 A    WO 94/26749 A

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