Description:
<jats:title>Abstract</jats:title><jats:p>The carbacyclin precursors <jats:bold>11, 17, 18</jats:bold> have been prepared from the en‐ynes <jats:bold>10, 15, 16</jats:bold> by cobalt‐mediated cyclization (Pauson‐Khand reaction) with varying degrees of diastereoselectivity.</jats:p>