Convenient modification of the Leimgruber-Batcho indole synthesis: reduction of 2-nitro-β-pyrrolidinostyrenes by the FeCl3–activated carbon–N2H4∙H2O system
作者:I. V. Taydakov、T. Ya. Dutova、E. N. Sidorenko、S. S. Krasnoselsky
DOI:10.1007/s10593-011-0776-2
日期:2011.7
A new catalytic system containing ferric chloride, activated carbon, and hydrazine has been proposed for the reductive cyclization of beta-dialkylamino-2-nitrostyrenes to give the corresponding indoles (Leimgruber-Batcho synthesis). Various substituted indoles may be obtained in high yield under these conditions.
Microwave assisted Leimgruber–Batcho reaction for the preparation of indoles, azaindoles and pyrroylquinolines
作者:Jason Siu、Ian R. Baxendale、Steven V. Ley
DOI:10.1039/b313012f
日期:——
catalysed Leimgruber-Batcho indole synthesis using microwave acceleration is described. This approach has permitted the preparation of a variety of heteroaromatic enamine intermediates in good yield and high purities. Subsequent catalytic hydrogenation reactions, under various conditions including the use of a solid-phase encapsulated catalyst, furnish the corresponding indole derivatives in good yields