Enantioselective conjugate radical addition reactions mediated by chiral Lewis acid complexes of (R,R)-4,6-dibenzofurandiyl-2,2′-bis(4-phenyloxazoline) (DBFOX/Ph)
作者:Ulrich Iserloh、Dennis P Curran、Shuji Kanemasa
DOI:10.1016/s0957-4166(99)00238-4
日期:1999.6
A high-yielding synthesis (50% overall yield) of tridentate bisoxazoline ligand (R,R)-4,6-dibenzofurandiyl-2,2'-bis(4-phenyloxazoline) (DBFOX/Ph) was developed. DBFOX/Ph was subsequently tested in enantioselective conjugate radical additions onto 3-(3-phenyl-2-propenoyl)-2-oxazolidinone Two dozen Lewis acids were evaluated, and Mg(ClO4)(2) emerged as the best Lewis acid in terms of yield and enantioselectivity (100% yield, 75.4% ee (S)). (C) 1999 Elsevier Science Ltd. All rights reserved.