The diastereoselective oxidation of sulfides into sulfoxides has been achieved with enantiomerically pure dihydrooxazole auxiliaries. When an additional hydroxymethyl substituent is present, diastereocontrol is very high and 1,5-asymmetric induction has been achieved with up to 96 : 4 selectivity, and 1,6-asymmetric induction has been achieved with up to 97 : 3 selectivity in the absence of any additional chiral agents.
用对映纯的二氢
噁唑辅基实现了
硫化物向亚磺酰胺的非对映选择性氧化。当存在额外的羟甲基取代基时,非对映选择性非常高,1,5-不对称诱导可达到96:4的选择性,而在没有额外的手性试剂的情况下,1,6-不对称诱导可达到97:3的选择性。