Synthesis of unusual cholestane analogs by Diels-Alder reaction (A+CD → ABCD)
摘要:
Unprecedented cholestane analogs have been synthesized by Diels-Alder reactions between a diene generated in high yields from vitamin D-3 and appropriate dienophiles. This strategy is useful for the scarcely utilized A+CD --> ABCD approach to the tetracyclic steroid nucleus. (C) 1997 Published by Elsevier Science Ltd.