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.
Concise, stereodivergent and highly stereoselective synthesis of <i>cis-</i> and <i>trans</i>-2-substituted 3-hydroxypiperidines – development of a phosphite-driven cyclodehydration
作者:Peter H Huy、Julia C Westphal、Ari M P Koskinen
DOI:10.3762/bjoc.10.35
日期:——
A concise (5 to 6 steps), stereodivergent, highly diastereoselective (dr up to >19:1 for both stereoisomers) and scalable synthesis (up to 14 g) of cis- and trans-2-substituted 3-piperidinols, a core motif in numerous bioactive compounds, is presented. This sequence allowed an efficient synthesis of the NK-1 inhibitor L-733,060 in 8 steps. Additionally, a cyclodehydration-realizing simple triethylphosphite