Influence of α-methyl substitution of proline-based organocatalysts on the asymmetric α-oxidation of aldehydes
作者:Sok-Teng (Amy) Tong、Margaret A. Brimble、David Barker
DOI:10.1016/j.tet.2009.04.060
日期:2009.6
The direct asymmetric organocatalytic α-oxidation of aldehydesusing trans-2-(p-methylphenylsulfonyl)-3-phenyloxaziridine is reported. This method affords the S isomer of α-hydroxy aldehydes, thereby complementing the selectivity for the R isomer observed using the two-step nitrosobenzene method. Use of α-methylproline and α-methylproline tetrazole significantly increases the enantioselectivity observed