Refined routes to chlorin building blocks

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

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Reexamination Certificate

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07470785

ABSTRACT:
A method of making chlorins comprises the steps of reacting (e.g. condensing) a dipyrrin western half intermediate with an eastern half intermediate to form a tetrahydrobilene, and then cyclizing the tetrahydrobilene to form a chlorin. Intermediates including tetrahydrobilenes useful in such reactions are also described.

REFERENCES:
patent: 5225433 (1993-07-01), Dougherty et al.
International Search Report for International Application Ser. NO. PCT/US02/14503 dated Aug. 7, 2002.
Taniguchi et al.,Chemical Abstracts136:30780 (2001).

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