Stereoselective functionalisation of SuperQuat enamides: asymmetric synthesis of homochiral 1,2-diols and α-benzyloxy carbonyl compounds
作者:Caroline Aciro、Stephen G. Davies、A. Christopher Garner、Yutaka Ishii、Min-Suk Key、Kenneth B. Ling、R. Shyam Prasad、Paul M. Roberts、Humberto Rodriguez-Solla、Catherine O'Leary-Steele、Angela J. Russell、Hitesh J. Sanganee、Edward D. Savory、Andrew D. Smith、James E. Thomson
DOI:10.1016/j.tet.2008.07.012
日期:2008.9
1′-m-chlorobenzoyl-2′-hydroxy derivatives (≥96% de) generates homochiral 1,2-diols in ≥96% ee. Alternatively, regioselective lithiation of the enamide at C(1′) with tBuLi followed by reaction with an aromatic aldehyde and in situ O-benzylation generates a 1′-(benzyloxy-aryl-methyl) substituted enamide with high diastereoselectivity. Subsequent oxidative cleavage of the enamide CC bond with NaIO4/RuCl3 followed by