A Simple Stereoselective Synthesis of Enantiopure 2-Substituted Pyrrolidines and Piperidines from Chiral (R)-Phenylglycinol-Derived Bicyclic 1,3-Oxazolidines
作者:José M. Andrés、Ignacio Herráiz-Sierra、Rafael Pedrosa、Alfonso Pérez-Encabo
DOI:10.1002/(sici)1099-0690(200005)2000:9<1719::aid-ejoc1719>3.0.co;2-r
日期:2000.5
Chiral, nonracemic 2-substituted pyrrolidines and piperidines were prepared in high ee and moderate to good chemical yields in three steps from (R)-phenylglycinol and γ- or δ-chloroketones. The key step of the synthesis was the stereoselective reductive ring-opening of chiral bicyclic 1,3-oxazolidines prepared by condensation of (R)-phenylglycinol and the corresponding ketones.
手性、非外消旋的 2-取代吡咯烷和哌啶通过三个步骤从 (R)-苯基甘氨醇和 γ-或 δ-氯酮以高 ee 和中等至良好的化学产率制备。合成的关键步骤是通过 (R)-苯基甘氨醇和相应的酮缩合制备的手性双环 1,3-恶唑烷的立体选择性还原开环。