PROCESS FOR PREPARATION OF LEVONORGESTREL
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United States of America Patent
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Issued Date -
Dec 5, 2013
app pub date -
Feb 14, 2012
filing date -
Feb 17, 2011
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Abstract
The present invention provides an improved process for preparation of levonorgestrel (3) which comprises of hydrolysis of 13β-ethyl-3-methoxy-17α-ethynyl-gona-2,5(10)-dien-17β-ol (2) with an acid in aprotic solvent. The present invention also provides a novel process for purification of crude levonorgestrel (3) by recrystallization from N,N-dimethyl formamide-water; methanol-water mixture.
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