Asymmetric synthesis of (1R,8S)- and (1S,8S)-1-hydroxypyrrolizidin-3-ones from Boc-<scp>L</scp>-prolinal and (S)- and (R)-[(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Fe(CO)(PPh<sub>3</sub>)(Ac)], respectively
作者:R. Paul Beckett、Stephen G. Davies
DOI:10.1039/c39880000160
日期:——
The aldol reaction between the aluminium enolate derived from (S)-[(η5-C5H5)Fe(CO)(PPh3)(Ac)](S)-(3) and Boc-L-prolinal (S)-(2) gives, after deprotection and decomplexation, (1R,8S)-1-hydroxypyrrolizidin-3-one, (1), while its epimer (1S,8S)-(1) is obtained in a similar way from (R)-(3), the inherent stereocontrol of (2) being overpowered by the iron chiral auxiliary.
从(衍生的烯醇化物的铝之间的醛醇缩合反应小号[(η - )5 -C 5 H ^ 5)的Fe(CO)(PPH 3)(AC)](小号) - (3)和制备Boc-大号脯氨醛(小号)-(2)在脱保护和解复合后,得到(1 R,8 S)-1-羟基吡咯嗪丁-3-one(1),而其差向异构体(1 S,8 S)-(1)在从(R)-(3)类似的方式,(2的固有立体声控制)被铁手性助剂压倒。