A short way to invert configuration of the 2,3-hydroxy groups in ecdysteroids
摘要:
3-epi-2-Dehydro-20-hydroxyecdysone and its 20,22-acetonide were reduced with lithium tris(secbutyl) hydridoborate selectively at the 2-oxo group with formation of 2 beta,3 beta-dihydroxy derivatives and the corresponding 2 alpha,3 alpha epimers which were separated by chromatography.
Regio- and stereodirected transformation of 20-hydroxyecdysone to 2-dehydro-3-epi-20-hydroxyecdysone under ozonization in pyridine
摘要:
A minor ecdysteroid from Froelichia floridana, namely, 2-dehydro-3-epi-20-hydroxyecdysone has been obtained by the one stage ozonization of 20-hydroxyecdysone in pyridine.