Catalytic enantioselective 1,3-dipolar cycloadditions of alkyl diazoacetates with α,β-disubstituted acroleins
作者:Lizhu Gao、Geum-Sook Hwang、Mi Young Lee、Do Hyun Ryu
DOI:10.1039/b910321j
日期:——
A catalytic route to highly functionalized chiral 2-pyrazolines by an asymmetric 1,3-dipolar cycloaddition reaction of ethyl diazoacetate with α-substituted and α,β-disubstituted acroleins has been developed; in the presence of chiral (S)-oxazaborolidinium ion 1 as catalyst, the reaction proceeded with high to excellent enantioselectivities (up to 99% ee).
通过重氮乙酸乙酯与δ±-取代和δ±,δ²-二取代丙烯醛的不对称 1,3-二极环加成反应,开发出了一条获得高官能化手性 2-吡唑啉的催化途径;在手性 (S)-oxazaborolidinium 离子 1 作为催化剂存在的情况下,反应以高到极好的对映选择性进行(ee 高达 99%)。