Regioselectivity in benzotropolone formation between catechins and proanthocyanidins.
A theaflavin-related benzotropolone pigment formed between procyanidin B-1 and (-)-epigallocatechin was synthesized enzymatically for the first time. The condensation occurred regioselectively at the extension (upper) unit of the procyanidin, probably due to a steric effect.
Tanaka
Takashi
T
Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
Inoue
Kyoko
K
Kouno
Isao
I
D044946:Biflavonoids / Q000138:chemical synthesis*; D002392:Catechin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D044945:Proanthocyanidins / Q000138:chemical synthesis / Q000737:chemistry*; D027843:Vitis
D044946:Biflavonoids; D044945:Proanthocyanidins; C508389:benzotropolone; D002392:Catechin