作者:Patricia Llanes、Carles Rodríguez-Escrich、Sonia Sayalero、Miquel A. Pericàs
DOI:10.1021/acs.orglett.6b03156
日期:2016.12.16
A set of six solid-supported diarylprolinol catalysts (varying on the anchoring strategy and the type of polymeric support) has been prepared and applied to the enantioselective cyclopropanation reaction. The selected candidate allows implementation of a long flow experiment (48 h) and generates a library of 12 cyclopropanes by sequential flow experiments. The mildness and utility of the method have
The first asymmetric [3+2] cycloaddition of vinyl aziridines with α,β‐unsaturatedaldehydes, based on synergistic catalysis, is disclosed. This methodology allows the formation of attractive pyrrolidine structures in good yields (up to 84 %), moderate diastereoselectivity, and high enantioselectivity values (up to >99 % ee). Additionally, a tricyclic pyrrolidine core structure found in biologically
The stereoselective [3 + 2] cycloaddition between vinylcyclopropanes and α,β-unsaturatedaldehydes promoted by combined palladium and organocatalysis is disclosed. The unique synergistic catalytic system allows for the stereoselective formation of highly substituted cyclopentanes with up to four stereocenters in high yields and selectivities. Vinylcyclopropanes with two different geminal substituents
Rhodium-catalyzed C–H activation and conjugate addition under mild conditions
作者:Luo Yang、Camille A. Correia、Chao-Jun Li
DOI:10.1039/c1ob05993a
日期:——
An efficient rhodiumIII-catalyzed CâH activation and subsequent conjugate addition was achieved under mild conditions. The reaction utilized inert arenes to replace stoichiometric organometallic reagents and can tolerate various functional groups as well as air and water.
Highly enantioselective tandem cycloisomerization/Diels–Alder reaction of 2-(1-alkynyl)-2-alken-1-ones and enals: dual catalysis with platinum and amines
作者:Liejin Zhou、Lu Liu
DOI:10.1039/d1cc02080c
日期:——
strategy of enantioselective synthesis of 2,3-furan-fused carbocycles bearing three-contiguous stereocenters. This transformation is catalyzed by dual catalysis of PtCl4/chiral amines via tandem dehydrogenative annulation/Diels–Alder reaction of 2-(1-alkynyl)-2-alken-1-ones and enals. The in situ generation of the furan-based ortho-quinodimethane intermediates and the iminium activation of enals are crucial