Isolation and Structures of Dicyanide Derivatives, Epurpurins A to C, from Emericella purpurea

Abstract

Three new yellow pigments, designated epurpurins A-C (1-3), were isolated along with variecolin and emindole PA from the dichloromethane extract of rice fermented with Emericella purpurea. Compounds of 1-3 were established as 2, 3-dicyano-1, 4-di(4-hydroxyphenyl)-1, 3-butadiene derivatives by spectroscopic and chemical investigation and X-ray analysis of the dimethyl ether of epurpurin C (4).