Process for the synthesis of dipyrromethanes

Details Process for the synthesis of dipyrromethanes Process for the synthesis of dipyrromethanes

2005-02-08

2005-02-08

Lambkin, Deborah C. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C548S564000

Reexamination Certificate

active

06852864

ABSTRACT:
The present invention provides an improved method for the preparation of dipyrromethanes by reacting the pyrrole with an aldehyde in the presence of an cation exchange resin.

REFERENCES:
patent: 5883246 (1999-03-01), Bruckner et al.
patent: 5919923 (1999-07-01), Bruckner et al.
Lee CH, Lindsey JS. One-flask synthesis of meso-substituted dipyrromethanes and their application in the synthesis of trans-substituted porphyrin building blocks. Tetrahedron 1999;50:11427-40.*
C.H. Lee et al.,Tetrahedron, 1995, 51(43):11645-11672.
D.M. Wallace et al.,J. Org. Chem., 1993, 58(25):7245-7257.
J.C. Sessler et al.,J Amer. Chem. Soc., 1993, 115(11):4618-4628.
R.K. Pandey et al.,Tetrahedron Letters, 1992, 33(37):5315-5318.

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