Boron Dipyrromethene (BODIPY) as Electron‐Withdrawing Group in Asymmetric Copper‐Catalyzed [3+2] Cycloadditions for the Synthesis of Pyrrolidine‐Based Biological Sensors
studies and comparison with other common electron‐withdrawing groups in asymmetric copper‐catalyzed [3+2] cycloadditions show the reasons of the different reactivity of the boron dipyrromethene derivatives, which can be exploited as a useful activating group in asymmetric catalysis. Additional experiments show that the so obtained pyrrolidines can be employed as biocompatible biosensors, which can be located
Ag(<scp>i</scp>)/(<i>S</i>,<i>S</i>)-ip-FOXAP catalyzed diastereo- and enantioselective 1,3-dipolar cycloaddition of azomethine ylides with benzosultam-3-ylidenes
作者:Luzhen Jiao、Guorui Cao、Dawei Teng
DOI:10.1039/d1nj01284c
日期:——
The AgOAc/ip-FOXAP complex catalyzed the highly diastereo- and enantioselective1,3-dipolarcycloaddition of azomethine ylides with benzosultam-3-ylidenes to give a single isomer of the exo-cycloadduct in good yield. For azomethine ylides, the presence of the Cα-substituted group enables its coordination to the silver center, which is of dramatic importance for the asymmetric reaction yield and for
Cu-catalyzed asymmetric [3+2] cycloaddition of α-iminoamides with activated olefins
作者:María González-Esguevillas、Javier Adrio、Juan C. Carretero
DOI:10.1039/c2cc17149j
日期:——
A variety of 2-amido pyrrolidines, including Weinreb-type amides, have been prepared with very high exo diastereoselectivity and enantioselectivitiy in the reaction of alpha-iminoamides with activated alkenes catalyzed by Cu(I)-Segphos ligands.