Regioisomerically pure oxochlorins and methods of synthesis
申请人:North Carolina State University
公开号:US06765092B2
公开(公告)日:2004-07-20
A method of making an oxochlorin comprises the steps of oxidizing a chlorin to produce a mixture of hydroxychlorin and oxochlorin, and then oxidizing the hydroxychlorin in said mixture, preferably with DDQ, to produce a mixture consisting essentially of oxochlorin. The step of oxidizing a chlorin is carried out by exposing the chlorin to alumina, typically in the presence of an oxidizing agent such as air or alumina. The oxidizing steps may be carried out in an organic solvent such as toluene. The chlorin is preferably a C-methylated chlorin, and is preferably metalated.
Synthesis and Electronic Properties of Regioisomerically Pure Oxochlorins
作者:Masahiko Taniguchi、Han-Je Kim、Doyoung Ra、Jennifer K. Schwartz、Christine Kirmaier、Eve Hindin、James R. Diers、Sreedharan Prathapan、David F. Bocian、Dewey Holten、Jonathan S. Lindsey
DOI:10.1021/jo025843i
日期:2002.10.1
We describe a two-step conversion of C-alkylated zinc chlorins to zinc oxochlorins wherein the keto group is located in the reduced ring (17-position) of the macrocycle. The transformation proceeds by hydroxylation upon exposure to alumina followed by dehydrogenation with DDQ. The reactions are compatible with ethyne, iodo, ester, trimethylsilyl, and pentafluorophenyl groups. A route to a spirohexyl-substituted