摘要:
Provided is an improved synthesis of quetiapine and pharmaceutically acceptable salts using a compound of formula [III] wherein A is chlorine, bromine or iodine which is formed by reaction of a compound of formula [II] with a halogenating agent and an aliphatic halogenated hydrocarbon in the absence of a base.
摘要:
Provided are processes for purifying (3R,4S)-4-(4-hydroxyprotected-phenyl)- l-(4-fluorophenyl)-3-[3-(4-fluorophenyl)-3-oxopropyl]azetidin-2-one having the following formula II, wherein X and Y are hydrogen or a substituted or unsubstituted C1-8 alkyl; n is an integer between 0 and 3; and P is a hydroxyl protecting group. The Compound of formula II may be converted to an azetidinone compound, which is useful, for example, in reducing cholesterol in mammals.
摘要:
Provided are syntheses of (S)-(+)-3-(aminomethyl)-5-methylhexanoic acid, (S)- Pregabalin via a chiral intermediate of the following formula (4) wherein Ar is a C6-10 aromatic group, R is a straight or branched C1-4 alkyl, ester, or carboxylic acid, and R1 is a straight or branched C1-5 alkyl, aralkyl, or substituted aralkyl.
摘要:
Provided are processes for the synthesis of 5 -phenyl- 1-trityl-lH-tetrazole, an intermediate useful in the synthesis of irbesartan. The tritylation of 5-phenyl-lH-tetrazole is carried out using phase transfer catalysis in a biphasic solvent system.
摘要:
The invention encompasses the synthesis of (S)-(+)-3-(aminomethyl)-5- methylhexanoic acid, (S)-Pregabalin, via the intermediate, (3R)-5-methyl-3-(2-oxo-2{[(lR)- l-phenylethyl]amino} ethyl)hexanoic acid.
摘要:
Crystalline forms of Varenicline Tosylate, processes for preparing those crystalline forms of Varenicline Tosylate, and processes for obtaining high purity Varenicline base using Varenicline Tosylate are provided.