Use of Strain-Release for the Diastereoselective Construction of Quaternary Carbon Centers
作者:Tobias Pinkert、Mowpriya Das、Malte L. Schrader、Frank Glorius
DOI:10.1021/jacs.1c03492
日期:2021.5.26
formation of quaternary carbon centers with excellent diastereoselectivity via a strain-release protocol. An organometallic species is generated by Cp*Rh(III)-catalyzed C–H activation, which is then coupled with strained bicyclobutanes (BCBs) and a prochiral carbon electrophile in a three-component reaction. This work illustrates a rare example of BCBs in transition metal catalysis and demonstrates their
Palladium-catalyzed C–H activation/C–C cross-coupling reactions via electrochemistry
作者:Cong Ma、Chuan-Qi Zhao、Yi-Qian Li、Li-Pu Zhang、Xue-Tao Xu、Kun Zhang、Tian-Sheng Mei
DOI:10.1039/c7cc07429h
日期:——
Palladium-catalyzed C–H activation/C–C cross-couplingreactions have emerged as attractive tools for organic synthesis. Typically, these reactions require stoichiometric chemical oxidants and exogenous ligands to regenerate the palladium catalyst and promote reductive elimination respectively. However, there are significant disadvantages associated with the use of traditional stoichiometric oxidants
A palladium-catalyzed ortho-directed alkylation of O-methyl ketoximes that proceeds through a regioselective ring-opening reaction of epoxides has been demonstrated. This C(sp2)–H activation/alkylation protocol was carried out in pivalic acid/1,1,1,3,3,3-hexafluoro-2-propanol (PivOH/HFIP, 2:8) as the solvent and was applied to various O-methyl ketoximes that contain either electron-donating or electron-withdrawing
Rhodium-Catalyzed Direct C-H Phosphorylation of (Hetero)arenes Suitable for Late-Stage Functionalization
作者:Minsik Min、Dahye Kang、Sungwoo Jung、Sungwoo Hong
DOI:10.1002/adsc.201600014
日期:2016.4.14
Efficient rhodium‐catalyzed direct C–H phosphorylation of (hetero)arenes was developed. Various directing groups and a wide range of substrates, including heterocycles, can be utilized in this C–H phosphorylation process, allowing for the rapid installation of the phosphonate group into medicinally and biologically important privileged scaffolds. The efficient and straightforward method could serve
Rh(III)-Catalyzed C–H Alkylation of Arenes Using Alkylboron Reagents
作者:He Wang、Songjie Yu、Zisong Qi、Xingwei Li
DOI:10.1021/acs.orglett.5b01232
日期:2015.6.5
alkylation of arenes using commercially available alkyltrifluoroborates is disclosed. Oximes, heteroarenes, azomethines, N-nitrosoamines, and amides are viable directing groups to entail this transformation. The alkyl group in the boron reagent can be extended to primary alkyls, benzyl, and cycloalkyls, and the reaction proceeded with controllable mono- and dialkylation selectivity when both ortho C–H