PROCESSES FOR THE PREPARATION OF ESTETROL AND INTERMEDIATES THEREOF
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United States of America
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Nov 7, 2024
app pub date -
Jul 20, 2022
filing date -
Jul 20, 2022
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Abstract
A process for the preparation of a compound of formula (IIa) is described where A is a silyl protecting group, in high diastereoisomeric purity and in crystalline form, comprising the crystallization of a mixture of the compound of formula (IIa) and its isomer of formula (IIb), where A is a silyl protecting group, from an ethereal solvent. The invention also provides a process for preparing Estetrol of formula (I) in high diastereoisomeric purity, comprising the use of the compound of formula (IIa), in a crystalline form, as a starting material.
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