Sonogashira coupling and cyclization reactions on alumina: a route to aryl alkynes, 2-substituted-benzo[b]furans and 2-substituted-indoles
摘要:
A solventless, microwave-enhanced Sonogashira coupling reaction of aromatic iodides with terminal alkynes on potassium fluoride doped alumina in the presence of palladium powder, cuprous iodide, and triphenylphosphine has been developed. The reaction can be utilized to prepare aryl alkynes in excellent yields. The coupling of o-iodophenol with terminal alkynes leads to the formation 2-substituted-benzo[b]furans. Whereas the coupling of o-iodoanilines with terminal alkynes generates indole products. An in situ desilylation reaction was also developed. (C) 2001 Elsevier Science Ltd. All rights reserved.
Rapid microwave-enhanced, solventless Sonogashira coupling reaction on alumina
作者:George W Kabalka、Lei Wang、Vasudevan Namboodiri、Richard M Pagni
DOI:10.1016/s0040-4039(00)00774-7
日期:2000.7
A microwave-enhanced, solventless Sonogashira coupling reaction has been developed. Terminal alkynes couple with aryl or alkenyl iodide on palladium-doped alumina in the presence of triphenylphosphine and cuprous iodide to provide high yields of products. (C) 2000 Published by Elsevier Science Ltd.