Ruthenium-catalyzed intramolecular cyclization of diazo-β-ketoanilides for the synthesis of 3-alkylideneoxindoles
作者:Wai-Wing Chan、Tsz-Lung Kwong、Wing-Yiu Yu
DOI:10.1039/c2ob06985g
日期:——
With [Ru(p-cymene)Cl2]2 as catalyst, diazo-β-ketoanilides would undergo intramolecular carbenoid arene CâH bond functionalization to afford 3-alkylideneoxindoles in up to 92% yields. The reaction occurs under mild conditions and exhibits excellent chemoselectivity. The lack of primary KIE (kH/kD â¼ 1) suggests that the reaction should not proceed by rate-limiting CâH bond cleavage; a mechanism involving cyclopropanation of the arene is proposed.