Enantioselective Synthesis ofAmaryllidaceaeAlkaloids (+)-Vittatine, (+)-epi-Vittatine, and (+)-Buphanisine
摘要:
Cat. on a hot tin roof: Enantioselective catalytic Michael addition of α-cyanoketones to acrylates under bifunctional organocatalysis was used to construct the unique arylic all-carbon quaternary stereocenter, which is synthetically crucial in the chemical synthesis of optically pure cis-aryl hydroindole alkaloids. The protocol offers an asymmetric route to (+)-vittatine, (+)-epi-vittatine, and (+)-buphanisine.
Tailored Polymer‐Supported Templates in Dynamic Combinatorial Libraries: Simultaneous Selection, Amplification and Isolation of Synthetic Receptors
作者:Pol Besenius、Peter A. G. Cormack、Jingyuan Liu、Sijbren Otto、Jeremy K. M. Sanders、David C. Sherrington
DOI:10.1002/chem.200800326
日期:2008.10.10
thermodynamically controlled synthesis and isolation of macrocyclic receptors from dynamic combinatoriallibraries has been achieved in a single step using a polymer-supported template. The templates were cinchona alkaloids which show interesting enantio- and diastereoselective molecular recognition events in libraries based on pseudo-dipeptide building blocks. The synthetic routes used to derivatise the