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Methyl pheophorbide

It is interesting to note that the magnesium or zinc complexes of methyl pheophorbide a (11, M = Mg, Zn R = C02Me) or methyl pyropheophorbide a (11, M = Mg, Zn R = H) are cleaved between positions 20 and 1 by singlet oxygen, whereas in contrast nature cleaves the chlorin at the 4,5-C —C double bond.44-45a h46 The ring fission at the 4.5-C —C double bond can be achieved with the cadmium(II) complex of methyl pheophorbide (11, M = Cd R = C02Me) to produce 12.43i... [Pg.629]

Methyl pheophorbide b Methyl pheophorbide 6-3-methanol 1-CbH7(C) 22... [Pg.208]

Zinc complex of methyl-pheophorbide a 9-Hydroxydesaxometh-ylpheophorbide a C 6% 22... [Pg.220]

Figure 15. Structure of ethers derived from methyl pheophorbide-a. Figure 15. Structure of ethers derived from methyl pheophorbide-a.
Scheme 7. Partial synthesis of the elusive red chlorophyll catabolite (RCC, 11) from pheophorbide a (5a). Photo-oxygenolysis of Cd-methyl-pheophorbidate a (Cd-13) gave Cd-methyl-4,5-dioxo-4,5-secopheophorbidate a (14) (besides a trace of the isomeric Cd-methyl-19,20-dioxo-19,20-seco-pheophorbidate, Cd-15) reduction of 14 with sodium borohydride and metal extrusion with dilute aqueous acid provided mcthyl-4,5-dioxo-4,5-seco-pheophorbidate 16 in good yield partial hydrolysis of the red diester 16 with pig liver esterase was regio-selective and produced red chlorophyll catabolite 11 (RCC)... Scheme 7. Partial synthesis of the elusive red chlorophyll catabolite (RCC, 11) from pheophorbide a (5a). Photo-oxygenolysis of Cd-methyl-pheophorbidate a (Cd-13) gave Cd-methyl-4,5-dioxo-4,5-secopheophorbidate a (14) (besides a trace of the isomeric Cd-methyl-19,20-dioxo-19,20-seco-pheophorbidate, Cd-15) reduction of 14 with sodium borohydride and metal extrusion with dilute aqueous acid provided mcthyl-4,5-dioxo-4,5-seco-pheophorbidate 16 in good yield partial hydrolysis of the red diester 16 with pig liver esterase was regio-selective and produced red chlorophyll catabolite 11 (RCC)...
A (197) and B (198) were reported as new chlorophyll derivatives from A. elegans [168,292] and aristophyll C (199) was also found as a new chlorophyll in A. heterophylla [232], Methyl pheophorbide-a (200) and methyl 21-hydroxy-(21f )-pheophorbide-a (201) were isolated from A. cucurbitifolia [56,159], A known chlorophyll, pheophytin-a (202), was isolated from A. kaempferi [229]. Another new pheophytin-a derivative described from A. heterophylla is 132-hydroxy-(1325)-pheophytin-a (203) [232], Incidentally, all these chlorophylls were isolated by our group from Aristolochia species collected in Taiwan. [Pg.894]

Class, G. L., J. J. Katz, F. C. Pennington, M. R. Thomas, and H. H. Strain Nuclear Magnetic Resonance Spectra and Molecular Association of Chlorophylls a and h. Methyl Chlorophyllides, Pheophytins, and Methyl Pheophorbides. [Pg.159]

DiEtMeBPheod 4,5-diethyl methylbacteriopheophorbide d mesoporphyrin IX dimethyl ester Methyl Pheophorbide a Ethyl Chlorophyllide a or b Methyl Chlorophyllide a Methyl Pyrochlorophyllide a 3-vinyl-8-(E-2-nitrovinyl-l)deutero monoanion of 21-Methyl-5,10,15,20-tetraphenylporphyrin monoanion of 21-Phenyl-5,10,15,20-tetraphenylporphyrin dianion of 5,15-dimethyl-2,3,7,8,12,13,17,18-octaethylporphyrin... [Pg.59]

Shinoda, S. and Osuka, A., Transesterification of the.alpha.-keto ester in methyl pheophorbide-a. Tetrahedron Lett., 37, 4945, 1996. [Pg.2366]

See other pages where Methyl pheophorbide is mentioned: [Pg.626]    [Pg.627]    [Pg.627]    [Pg.633]    [Pg.967]    [Pg.967]    [Pg.403]    [Pg.419]    [Pg.403]    [Pg.419]    [Pg.336]    [Pg.114]    [Pg.14]    [Pg.14]    [Pg.15]    [Pg.15]    [Pg.360]    [Pg.360]    [Pg.173]    [Pg.210]    [Pg.128]    [Pg.245]    [Pg.82]   
See also in sourсe #XX -- [ Pg.3 , Pg.8 , Pg.30 ]

See also in sourсe #XX -- [ Pg.353 , Pg.360 ]



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