Synthesis of a Ketone Analogue of Biotin via the Intramolecular Pauson−Khand Reaction
摘要:
[GRAPHICS]We report an improved synthesis of 5-(5-oxohexahydrocyclopenta[c]thiophen-1-yl)pentanoic acid (ketone biotin, 1) based on the intramolecular Pauson-Khand cyclization. The synthesis proceeds in eight steps and in 2.7% overall yield from cyclohexene.