Efficient synthesis of pyropheophorbide a and its derivatives
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United States of America Patent
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May 30, 2006
Grant Date -
Mar 4, 2004
app pub date -
Jul 2, 2003
filing date -
Jul 2, 2002
priority date (Note) -
Expired
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Abstract
A process for the preparation of pyropheophorbide a and its derivatives, including 3-devinyl-3-(1'-hexyloxy)ethyl-pyropheophorbide-a, otherwise known as HPPH, is provided. The process involves treating chlorin e.sub.6, in the form of its trimethyl ester, with a base, followed by heating to give pyropheophorbide a, which is converted to HPPH by treatment with acid, followed by hexyl alcohol under basic conditions.
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