An efficient asymmetric synthesis of the mercaptopyrrolidine side chain of an important β-methyl carbapenem antibiotic
作者:Joseph D. Armstrong、Jennifer L. Keller、Joseph Lynch、Tom Liu、Frederick W. Hartner、Norikazu Ohtake、Shigemitsu Okada、Yasuyuki Imai、Osamu Okamoto、Ryosuke Ushijima、Susumu Nakagawa、R.P. Volante
DOI:10.1016/s0040-4039(97)00613-8
日期:1997.5
An efficient asymmetric synthesis of the mercaptopyrrolidine side chain 2 1s described. The β-ketoester 4 is hydrogenated diastereoselectively to give the (R)-β-hydroxyester 5. The remaining functional groups are installed via a thiol Mitsunobu reaction and a reduction of a secondary amide to produce 2 in 34% overall yield from BOC-L-trans-4-hydroxyproline methylester 3 (Scheme 1).
描述了巯基吡咯烷侧链2 1s的有效不对称合成。β-酮酯4非对映选择性地氢化,得到(R)-β-羟基酯5。剩余的官能团通过硫醇Mitsunobu反应和仲酰胺的还原而安装,从而从BOC-L-trans-4-羟基脯氨酸甲酯3(方案1)中以34%的总收率产生2个。