.beta.-Hydroxyamines and .beta.-hydroxysulfonamides are synthesized from olefin substrates by means on a catalyzed asymmetric addition reaction. The addition reaction is catalyzed by osmium and is co-catalyzed by chiral ligands. The chiral ligands, in addition to being co-catalysts with the osmium, also serve to direct the addition reaction regioselectively and enantioselectively. Divalent ligands are preferred over monovalent ligands because of their enhance regio- and enantio-selectivity. Sulfonamides are employed as an oxidant nitrogen source for the production of .beta.-hydroxysulfonamides. Excellent yields and enantiomeric efficiencies are achieved with co-solvents containing a 50/50 (v/v) mixtures of water and organic solvent. .beta.-Hydroxyamines are obtained by deprotecting the corresponding .beta.-hydroxysulfonamides.
.beta.-羟基胺和.beta.-羟基磺酰胺是通过催化不对称加成反应从烯烃底物合成的。加成反应由
钌催化,并由手性
配体共同催化。除了与
钌一起作为共催化剂外,手性
配体还用于选择性地定向加成反应的位置和对映选择性。二价
配体比单价
配体更受欢迎,因为它们具有更强的位置和对映选择性。磺酰胺被用作氧化剂氮源,用于生产.beta.-羟基磺酰胺。在含有50/50(体积比)的
水和有机溶剂混合物的共溶剂中,可实现优异的产率和对映效率。通过去保护相应的.beta.-羟基磺酰胺获得.beta.-羟基胺。