Photochemical synthesis of 2,3-homoindoles
Abstract
Irradiation of ethyl 2-cyano-4-methyl-1,2-di-hydroquinoline-1-carboxylates in ethanol gives stereospecifically ethyi endo-1-cyano-6b-methyl-1, 1a,2,6b-tetra-hydrocycloprop[b]indole-2-carboxylates(2,3-homoindoles) in 59–61% yields, which are shown to be useful synthetic intermediates for indole derivatives.