Copper-catalyzed asymmetric methylation of fluoroalkylated pyruvates with dimethylzinc
作者:Kohsuke Aikawa、Kohei Yabuuchi、Kota Torii、Koichi Mikami
DOI:10.3762/bjoc.14.44
日期:——
The catalytic asymmetric methylation of fluoroalkylated pyruvates is shown with dimethylzinc as a methylating reagent in the presence of a copper catalyst bearing a chiral phosphine ligand. This is the first catalytic asymmetric methylation to synthesize various α-fluoroalkylated tertiary alcohols with CF3, CF2H, CF2Br, and n-C n F2n+1 (n = 2, 3, 8) groups in good-to-high yields and enantioselectivities
在带有手性膦配体的铜催化剂存在下,用二甲基锌作为甲基化试剂显示了氟代烷基化丙酮酸的催化不对称甲基化。这是第一个催化不对称甲基化反应,以高至高收率和对映选择性合成具有CF3,CF2H,CF2Br和nC n F2n + 1(n = 2、3、8)基团的各种α-氟烷基化叔醇。手性膦配体的磷原子上的轴向骨架和取代基严重影响对映选择性。此外,发现仅通过手性膦而不使用铜可以促进简单的全氟烷基化的酮的甲基化。