Protected aldehydes for use as intermediates in chemical syntheses, and processes for their preparation
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United States of America Patent
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May 12, 2015
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Aug 15, 2013
app pub date -
Jul 22, 2011
filing date -
Jul 22, 2010
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Abstract
A para-methoxy protected benzaldehyde useful in preparation of treprostinil, and of formula: (Formula (1)) is prepared by subjecting to Claisen re-arrangement a substituted benzaldehyde of formula (1a): (Formula (Ia)) to form the m-hydroxy-substituted benzaldehyde of formula (1b): (Formula (Ib)) and then reacting compound (1b) with a p-methoxybenzyl (PMB) compound to form a PMB-substituted benzaldehyde of formula (1).
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