Site- and Enantiodifferentiating C(sp<sup>3</sup>)–H Oxidation Enables Asymmetric Access to Structurally and Stereochemically Diverse Saturated Cyclic Ethers
作者:Shutao Sun、Yiying Yang、Ran Zhao、Dongju Zhang、Lei Liu
DOI:10.1021/jacs.0c09636
日期:2020.11.11
A manganese-catalyzed site- and enantiodifferentiating oxidation of C(sp3)-H bonds in saturated cyclic ethers has been described. The mild and practical method is applicable to a range of tetrahydrofurans, tetrahydropyrans, and medium-sized cyclic ethers with multiple stereocenters and diverse substituent patterns in high efficiency with extremely efficient site- and enantiodiscrimination. Late-stage
Expeditious Synthesis of Hippuristanol and Congeners with Potent Antiproliferative Activities
作者:Wei Li、Yongjun Dang、Jun O. Liu、Biao Yu
DOI:10.1002/chem.200901732
日期:2009.10.12
Rapid access: An expeditioussynthesis of hippuristanol was developed that allowed rapid access to a number of analogues with structural alteration at its E and F rings (see scheme), facilitating the structure–activity relationship studies of the novel inhibitor of eukaryotic translation initiation.
2,2-Dimethyl-2,3-dihydrofuran, a new substrate for intermolecular asymmetric Heck reactions
作者:Alan J. Hennessy、Yvonne M. Malone、Patrick J. Guiry
DOI:10.1016/s0040-4039(99)01980-2
日期:1999.12
2,2-Dimethyl-2,3-dihydrofuran is tested as a new substrate for the intermolecularasymmetricHeck reaction. Phenylation proceeded in enantioselectivities of up to 98% ee with Pd0 complexes of diphenylphosphinoferrocenyloxazoline ligands.
A new twist: The catalytic asymmetric semipinacol rearrangement reaction of 2‐oxo allylic alcohols 1 in the presence of a catalytic amount of chiral phosphoric acid (R)‐2 a or its silver salt (R)‐2 b affords enantiomerically pure spiroethers 3.
A Versatile Enantioselective Catalytic Cyclopropanation‐Rearrangement Approach to the Divergent Construction of Chiral Spiroaminals and Fused Bicyclic Acetals
A highly enantioselective synthesis of various chiral heterobicyclic molecules including spiroaminals and fused bicyclic acetals has been developed via a chiral copper catalyzed cyclopropanation‐rearrangement (CP‐RA) approach under mild reaction conditions. Remarkably, the asymmetric CP‐RA for exocyclic vinyl substrates without a pro‐stereogenic carbon at the β‐position has been realized for the first