Enantioselective synthesis of α-sulfenylated ketones and aldehydes via α-thiolation of metalated SAMP/RAMP hydrazones
作者:Dieter Enders、Thomas Schäfer、Wolfgang Mies
DOI:10.1016/s0040-4020(98)00481-5
日期:1998.8
Asymmetric α-sulfenylation of lithiated SAMP/RAMP hydrazones (S)-2 with disulfides afforded α-thiolated hydrazones (S,R)-3 in good yields (48–87%) and high diastereomeric excesses (91–96%). Subsequent oxidative cleavage or acidic hydrolysis of the hydrazones furnished α-thiolated ketones (R)-4a-d with high enantiomeric excesses (87–>96%). α-Sulfenylated aldehydes (R)-8a-d were prepared by a similar reaction