from the presence of heteroatoms. Although considerable advances have recently been achieved in radical-involved catalytic asymmetric C–N bond formation, there has been little progress in the corresponding C–O bond-forming processes. Here, we describe a photoinduced copper-catalyzed cross-coupling of readily available oxime esters and 1,3-dienes to generate diversely substituted allylic esters with high
Cu-Catalyzed Enantioselective Reductive Coupling of 1,3-Dienes and Aldimines
作者:Mingfeng Li、Jiping Wang、Fanke Meng
DOI:10.1021/acs.orglett.8b03216
日期:2018.11.16
3-disubstituted allyl–Cu complexes from a Cu–H addition to 1,3-dienes followed by in situ reactions with aldimines to construct homoallylic amines is presented. The method is distinguished by an unprecedented pathway to generate enantiomerically enriched allyl–Cu species, allowing reactions with a wide range of aldimines in high chemo-, site-, diastereo-, and enantioselectivity. Functionalization provides useful
Palladium-Catalyzed Three-Component Cross-Coupling of Conjugated Dienes with Indoles Using Ethynylbenziodazolones as Electrophilic Alkynylating Reagents
作者:Jie Huang、Ling-Ling Chen、Zhi-Min Chen
DOI:10.1021/acs.orglett.2c02275
日期:2022.8.12
A palladium-catalyzed regioselective 1,2-alkynyl-carbonalization of conjugateddienes with ethynylbenziodazolone (EBZ) and indoles has been developed for the first time. Various molecules containing alkenyl, alkynyl, and indole groups were readily obtained. Moreover, the resulting products can be applied to various derivatizations. This protocol uses EBZ as an electrophilic alkynylating reagent, avoiding
AbstractOne of the most straightforward approaches to access chiral silanes is catalytic enantioselective hydrosilylation. Although significant advances have been achieved in enantioselective construction of either a carbon‐stereogenic center or a silicon‐stereogenic center through enantioselective hydrosilylation, simultaneous establishment of a carbon‐ and a silicon‐stereogenic center in an acyclic molecule through a single intermolecular hydrosilylation remained undeveloped. Herein, an unprecedented cobalt‐catalyzed regio‐, diastereo‐ and enantioselective hydrosilylation of 1,3‐dienes is presented, enabling construction of a carbon‐ and a silicon‐stereogenic center in a single intermolecular transformation. A wide range of chiral silanes bearing a carbon‐ and a silicon‐stereogenic center were generated in high efficiency and stereoselectivity. Functionalization of the enantioenriched silanes delivered a variety of valuable chiral building blocks that are otherwise difficult to access.
Palladium-Catalyzed Chemoselective Protodecarboxylation of Polyenoic Acids
作者:Mohammed H. Al-Huniti、Mark A. Perez、Matthew K. Garr、Mitchell P. Croatt
DOI:10.1021/acs.orglett.8b03016
日期:2018.12.7
Conditions for the first palladium-catalyzed chemoselective protodecarboxylation of polyenoic acids to give the desired polyenes in good yields are presented. The reactions proceed under mild conditions using either a Pd(0) or Pd(II) catalyst and tolerate a variety of aryl and aliphatic substitutions. Unique aspects of the reaction include the requirement of phosphines, water, and a polyene adjacent