Co<sup>III</sup>-Catalyzed C–H Alkenylation and Allylation with Cyclopropenes via Sequential C–H/C–C Bond Activation
作者:Ye Lim Kim、Sun-a Park、Seoung-Mi Choi、Jong-Un Park、Ju Hyun Kim
DOI:10.1021/acs.orglett.1c02219
日期:2021.9.3
An atom-economical strategy for the C–H alkenylation and C–H allylation of arenes by employing cyclopropenes as versatile alkenylating and allylating reagents is reported, catalyzed by cobalt. The Co-catalyzed C–H alkenylation process involves sequential C–H and C–C bond cleavage. Under the optimized conditions, broad-ranging alkenylated (hetero)arenes were synthesized with complete (E)-stereoselectivity
ligand furnished a variety of chiral bicyclic silaheterocycle derivatives with good enantioselectivity (up to 95.5:4.5 er). Owing to the mild reaction conditions, the good stereoselectivity profile, and the ready availability of the functionalized precursors, this process constitutes a useful and straightforward strategy for the synthesis of densely functionalized silacycles.
1-disubstituted cyclopropenes with the promotion of chiral DTBM-SEGPHOS is described. It allows for a straightforward access to potentially valuable chiral organosilicon compounds bearing a carbon quaternary stereocenter in high yields with good diastereo- and enantioselectivities (up to >99:1 d.r. and >99% ee) in a 100% atom-efficient manner from readily available starting cyclopropenes and hydrosilanes
Nickel‐Hydride‐Catalyzed Diastereo‐ and Enantioselective Hydroalkylation of Cyclopropenes
作者:Qingqin Huang、Ya Chen、Xueting Zhou、Lei Dai、Yixin Lu
DOI:10.1002/anie.202210560
日期:2022.11.14
The first nickel-hydride-catalyzed diastereo- and enantioselective hydroalkylation of cyclopropenes has been developed for rapid synthesis of chiral alkylcyclopropane motifs. The reaction is efficient and versatile, taking place under mild conditions, and having excellent functional group tolerance. Concise asymmetric synthesis of antidepressant drug, D-Milnacipran, was performed to demonstrate the