Asymmetric Copper-Catalyzed Carbozincation of Cyclopropenes en Route to the Formation of Diastereo- and Enantiomerically Enriched Polysubstituted Cyclopropanes
作者:Daniel S. Müller、Ilan Marek
DOI:10.1021/jacs.5b11220
日期:2015.12.16
The enantioselective synthesis of cyclopropylzinc reagents has been achieved via a copper-catalyzed carbozincation of 3,3-disubstituted cyclopropenes with diorganozincreagents. The obtained organozinc compounds can be easily functionalized with a broad range of electrophiles, including palladium-catalyzed cross-couplings, affording highly substituted cyclopropanes. The operationally simple procedure
Gold(i)-catalysed alcohol additions to cyclopropenes
作者:Maximillian S. Hadfield、Jürgen T. Bauer、Pauline E. Glen、Ai-Lan Lee
DOI:10.1039/c0ob00085j
日期:——
Gold(I)-catalysed addition of alcohols to 3,3-disubstituted cyclopropenes occurs in a highly regioselective and facile manner to produce alkyl tert-allylic ethers in good yields. The reaction is tolerant of sterically hindered substituents on the cyclopropene as well as primary and secondary alcohols as nucleophiles. In this full article, we report on the substrate scope and plausible mechanism, as well as the regioselectivity issues arising from subsequent gold(I)-catalysed isomerisation of tertiary to primary allylic ethers.
Rhodium-Catalyzed Arylation of Cyclopropenes Based on Asymmetric Direct Functionalization of Three-Membered Carbocycles
作者:Longyang Dian、Ilan Marek
DOI:10.1002/anie.201713324
日期:2018.3.26
A variety of highly diastereo‐ and enantiomerically enriched arylcyclopropanes is obtained through the asymmetricrhodium‐catalyzed arylation reaction of achiral nonfunctionalized cyclopropene derivatives with commercially available aryl boronic acids in the presence of (R,S)‐Josiphos.
Rhodium(III)-Catalyzed Transannulation of Cyclopropenes with<i>N</i>-Phenoxyacetamides through CH Activation
作者:Hang Zhang、Kang Wang、Bo Wang、Heng Yi、Fangdong Hu、Changkun Li、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201408555
日期:2014.11.24
An efficient rhodium(III)‐catalyzed synthesis of 2H‐chromene from N‐phenoxyacetamides and cyclopropenes has been developed. The reaction represents the first example of using cyclopropenes as a three‐carbon unit in rhodium(III)‐catalyzed C(sp2)Hactivations.