Process for preparing esters of 2-(6'-methoxy-2'-naphtyl)-propionic acid via rearrangement of new ketals of 2-halo-1-(6'-methoxy-2'-naphtyl)-propan-1-one and new esters of 2-(5'-bromo-6'-methoxy-2'-naphtyl)propionic acid thus prepared
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United States of America Patent
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Sep 2, 1986
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N/A
app pub date -
May 17, 1985
filing date -
Feb 26, 1980
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Expired
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Abstract
Process for preparing esters of 2-(6'-methoxy-2'-naphtyl)-propionic acid via rearrangement of new ketals of 2-halo-1-(6'-methoxy-2'-naphtyl)-propan-1-one in the presence of a Lewis acid. The esters thus obtained are useful as intermediate products for preparing Naproxen. The process involves the preparation of the following new compounds: ketals of 2-halo-1-(6'-methoxy-2'-naphtyl)-propan-1-one esters of 2-(5'-bromo-6'-methoxy-2'-naphtyl)-propionic acid 1-(5'-bromo-6'-methoxy-2'-naphtyl)-propan-1-one 2-halo-(5'-bromo-6'-methoxy-2'-naphtyl)-propan-1-one
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