Treatment of α-formyl amides with RAlCl2 or PhAlCl2 provided threo-α-alkyl-substituted β-hydroxy amides under high stereocontrol. The method was successfully applied to the selective addition of alkyl group to α-methyl-substituted β-keto amides or esters. Treatment of α-methyl-β-keto amides or α-methyl-β-keto esters with trialkylaluminium or alkylmanganese halide afforded the corresponding erythro (or threo) α-methyl-substituted β-hydroxy amides or α-methyl-substituted β-hydroxy esters with high stereoselectivity.
处理α-醛基酰胺与RAlCl2或PhAlCl2,在高立体控制下获得threo-α-烷基取代的β-羟基酰胺。该方法成功应用于选择性地将烷基引入α-甲基取代的β-酮酰胺或酯中。用三烷基铝或烷基
锰卤化物处理α-甲基-β-酮酰胺或α-甲基-β-
酮酯,能够以高立体选择性得到相应的erythro(或threo)α-甲基取代的β-羟基酰胺或α-甲基取代的β-羟基酯。