An efficient synthesis of 3,3′-dipyridyl BINOL ligands
摘要:
Microwave-assisted Suzuki cross-coupling between 2,2'-bis(methoxymethyl)-3,3'-bis(potassium trifluoroboronato)BINOL and a series of 2-bromo- or 2-chloropyridines provides efficient access to 3,3'-dipyridyl BINOL ligands. (C) 2009 Elsevier Ltd. All rights reserved.
An efficient synthesis of 3,3′-dipyridyl BINOL ligands
摘要:
Microwave-assisted Suzuki cross-coupling between 2,2'-bis(methoxymethyl)-3,3'-bis(potassium trifluoroboronato)BINOL and a series of 2-bromo- or 2-chloropyridines provides efficient access to 3,3'-dipyridyl BINOL ligands. (C) 2009 Elsevier Ltd. All rights reserved.
3,3‘-Dipyridyl BINOL Ligands. Synthesis and Application in Enantioselective Addition of Et<sub>2</sub>Zn to Aldehydes
作者:Robert R. Milburn、S. M. Shakil Hussain、Olaf Prien、Zaheer Ahmed、Victor Snieckus
DOI:10.1021/ol071276f
日期:2007.10.1
[GRAPHICS]3,3'-Di(2-pyridyl) BINOLs (4), prepared in three steps from commercial substances by a combined directed ortho metalation-Negishi cross-coupling protocol, constitute new members of the BINOL ligand family. They are among the most selective, general ligands, providing equal or greater stereoselectivities in the Et2Zn addition to benzaldehydes and cinnamalclehydes (Table 3) than any single BINOL ligand reported to date.