Selective metal-halogen exchange of 4,4′-dibromobiphenyl mediated by lithium tributylmagnesiate
摘要:
A selective metal-halogen exchange/electrophilic quench protocol on 4.4'-dibromobiphenyl 4 that proceeds under non-cryogenic 0 conditions is reported. This method provides an economic alternative to traditional transition-metal catalyzed cross-coupling chemistry to prepare various biaryls 7a-g. This novel route to functionalized biaryls was used as the basis for the kg-scale preparation of a biphenyl ketone 1, a key intermediate in the synthesis of a potent cathepsin K inhibitor. (c) 2006 Elsevier Ltd. All rights reserved.