Efficient, Stereodivergent Access to 3-Piperidinols by Traceless P(OEt)<sub>3</sub> Cyclodehydration
                                
                                    
                                        作者:Peter H. Huy、Ari M. P. Koskinen                                    
                                    
                                        DOI:10.1021/ol4026588
                                    
                                    
                                        日期:2013.10.18
                                    
                                    A stereodivergent and highly diastereoselective (dr up to >19:1 for both isomers), step economic (5-6 steps), and scalable synthesis (up to 14 g) of cis- and trans-2-substituted 3-piperidinols, the core motif of numerous bioactive compounds, providing efficient access to the NK-1 inhibitor L-733,060 is presented. Additionally, a "traceless" (referring to the simplified byproduct separation) cyclodehydration realizing simple P(OEt)(3) as a substitute for PPh3 is developed.