Porphyrins with exocyclic rings. Part 22: Synthesis of deoxophylloerythroetioporphyrin (DPEP), three ring homologues, and five related nonpolar …

TD Lash, W Li, DM Quizon-Colquitt

Index: Lash, Timothy D.; Li, Wei; Quizon-Colquitt, Desiree M. Tetrahedron, 2007 , vol. 63, # 50 p. 12324 - 12342

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Citation Number: 11

Abstract

Dipyrrolic intermediates incorporating five-membered carbocyclic rings are easily prepared from cyclopenta [b] pyrroles, and this unit represents the southern half of the DPEP-type geoporphyrins found in organic-rich sediments such as oil shales and petroleum. Related dipyrroles with six-, seven-or eight-membered carbocyclic rings were shown to give b- bilenes when reacted with dipyrrylmethane carbaldehydes under mildly acidic conditions. ...