Cobalt-mediated [2 + 2 + 2] cycloadditions en route to natural products: a novel total synthesis of steroids via the one-step construction of the B,C,D framework from an A-ring precursor
Cobalt-mediated [2 + 2 + 2] cycloadditions en route to natural products: a novel total synthesis of steroids via the one-step construction of the B,C,D framework from an A-ring precursor