Formation of stereoisomeric mixtures of naphthoquinone derivatives in Echium lycopsis callus cultures

H Fukui, M Tsukada, H Mizukami, M Tabata

Index: Fukui, Hiroshi; Tsukada, Minoru; Mizukami, Hajime; Tabata, Mamoru Phytochemistry (Elsevier), 1983 , vol. 22, # 2 p. 453 - 456

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Citation Number: 49

Abstract

Abstract Callus cultures of Echium lycopsis were shown to produce a large amount of a mixture of red pigments consisting of five esterified derivatives of 5, 8-dihydroxy-2-(1- hydroxy-4-methyl-3-pentenyl)-1, 4-naphthoquinone. Examination of the absolute configuration of these compounds revealed that the cultures produced both the R-form (shikonin) and the S-form (alkannin) in various ratios depending upon the esterified ...