Substrate-Controlled Construction of Spiro-3-Oxoindolines and Eight-Membered-Ring Lactams under Bubbling Air Conditions.
A substrate-controlled strategy for constructing spiro-3-oxoindolines and eight-membered-ring lactams from cyclic 2,3-dialkyl-substituted indoles has been developed, employing bubbling air to maximize the gas-liquid interfacial area. When tetrahydrocarbazoles and heteroatom-replaced (O and N) analogues were employed, o...