Synthesis of a Ketone Analogue of Biotin via the Intramolecular Pauson−Khand Reaction

Abstract
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.

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