Magnesium–Tartramide Complex Mediated Asymmetric Strecker-Type Reaction of Nitrones Using Cyanohydrin
作者:Takahiro Sakai、Takahiro Soeta、Kohei Endo、Shuhei Fujinami、Yutaka Ukaji
DOI:10.1021/ol400898p
日期:2013.5.17
An asymmetric Strecker-type reaction of nitrones using acetone cyanohydrin as a source of HCN has been realized. A magnesium–tartramide complex, generated from (R,R)-2,3-dihydroxy-1,4-di(pyrrolidin-1-yl)-butane-1,4-dione and MeMgBr, promoted transcyanation from the bromomagnesium salt of the cyanohydrin, in the presence of a catalytic amount of DBU, to afford the corresponding optically active (S)-α-amino
已经实现了使用丙酮氰醇作为HCN源的硝酮的不对称Strecker型反应。由(R,R)-2,3-二羟基-1,4-二(吡咯烷-1-基)-丁烷-1,4-二酮和MeMgBr生成的镁-酒石酸络合物促进了溴镁盐的氰化在催化量的DBU存在下,氰醇提供相应的旋光的(S)-α-氨基腈衍生物。该反应适用于给出高至优异对映选择性的各种硝酮。