STUDIES ON SYNTHESIS OF OSW-1 ANALOGUE WITH THIAZOLE RING AT SIDE CHAIN EMPLOYING WITTIG REARRANGEMENT

摘要

OSW-1 analogue with thiazole at the side chain was synthesized employing a tandem Williamson etherification - [2,3]-Wittig rearrangement, which provided a one-pot producer for the formation of (20S)-22-hydroxy steroids 6 and 7 from the known allylic alcohol 4 and 2-bromomethylthiazole as a key step. Glycosylation of steroid aglycone 17 with donors was investigated under various conditions.