alpha,alpha-disubstituted-alpha-nitroketones are reduced to the corresponding trisubstituted nitro alcohols in good to excellent yield and enantiomeric excess by borane-dimethyl sulfide in the presence of a chiral oxazaborolidine catalyst. Reduction of the nitro alcohols to the corresponding amino alcohols and their subsequent conversion to enantiomerically enriched 4,4,5-trisubstituted oxazoldinones
已经证明,在手性
恶唑硼烷催化剂的存在下,
硼烷-二甲
硫可以很好地至优异的产率和对映体过量将α,α-二取代的α-硝基酮还原为相应的三取代的硝基醇。还报道了将硝基醇还原为相应的
氨基醇,然后将其随后转化为对映体富集的4,4,5-三取代的
恶唑烷酮。