Tetrahedron p. 6645 - 6652 (1989)
Update date:2022-08-04
Topics:
Sambrotta, Luis
Rezzano, Irene
Buldain, Graciela
Frydman, Benjamin
A 8-demethyl-8-formyl-2,4-bis(β-chloroethyl)porphyrin and its 8-demethyl derivative were obtained from the oxidative cyclization of 2,4-bis(β-chloroethyl)-6-(β-ethoxycarbonylethyl)-7-(β-methoxycarbonylethyl)-1',1,3,5,8-pentamethyl a,c-biladiene dihydrobromide with copper(II) chloride in dimethyl formamide (DMF) in the presence of iodine and air.Under these reaction conditions the cyclization took place at 25 deg C and the formylporphyrin was obtained in 25 percent yield together with the C-8 unsubstituted porphyrin which was obtained in 50 percent yield.The latter could also be obtained in 65 percent yield by the oxidative cyclization with copper(II) chloride in DMF at 25 deg C of the β-unsubstituted 1,7-bis(β-chloroethyl)-4-(β-methoxycarbonylethyl)-5-(β-ethoxycarbonylethyl)-1',2,6,8,8'-pentamethyl-a,c-biladiene dihydrobromide.The formylation attempts at the C-8 unsubstituted position of this porphyrin were however unsuccesful, when either N,N-diisobutyl formamide (Vilsmeier-Haak reaction) or dichloromethyl methyl ether (Friedel Crafts reaction) were used.The title porphyrins were obtained from the aforementioned 2,4-bis(β-chloroethyl) porphyrins by vinylation of the latter with base. 8-Demethyl-8-formyl protoporphyrin IX is a valuable intermediate to probe into the biosynthesis of heme a.
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Doi:10.1016/S0040-4020(01)86083-X
(1988)Doi:10.1021/ja027748x
(2002)Doi:10.1002/ejoc.201500740
(2015)Doi:10.1016/j.ejmech.2009.09.020
(2010)Doi:10.1021/acschembio.7b00108
(2017)Doi:10.1021/jo00274a008
(1989)