esters have been prepared in a highly regio- and stereoselective manner through the decarboxylative Mannich reaction of β-keto acids with optically active N-tert-butanesulfinyl α-imino esters in the presence of 3 mol % La(OTf)3 or 5 mol % Y(OTf)3 at 20 °C. Preliminary mechanistic studies indicate that the reaction proceeds through imine addition followed by decarboxylation.
保护的γ氧代- α
氨基酯的范围都在一个高度区域选择性和立体选择性的方式通过与光学活性的β
酮羧酸的脱羧曼尼希反应制备ñ -叔-butanesulfinylα亚
氨基酯在3存在下mol%La(OTf)3或5 mol%Y(OTf)3在20°C时。初步的机理研究表明,该反应通过添加
亚胺然后进行脱羧来进行。