Cu-Catalyzed Alkylation of Grignard Reagents: A New Efficient Procedure
摘要:
The presence of NMP (4-9 equiv.) clearly improves the yield and the chemoselectivity of the Cu-catalyzed alkylation of organomagnesium reagents. Thus, secondary and tertiary alkylmagnesium chlorides were used successfully for the first time in such a reaction and ester, amide, nitrile or keto groups are tolerated. The procedure is cheap, environmentally friendly and very easy to carry out (1-3% Li2CuCl4 or CuCl, THF, 20 degrees C). It is an interesting alternative to the classical alkylation of organocuprates reagents. (C) 2000 Published by Elsevier Science Ltd.