报道了铜催化下 α,β-不饱和砜的不同官能化。使用铜催化剂、磷酸烯丙酯、双(频哪醇)二硼和LiOMe实现了烯基砜的非对映选择性硼基化烯丙基化。在该方法中,将铜-硼基络合物添加到烯基砜中并随后进行烯丙基取代,使得硼烯丙基化产物具有良好的产率和优异的顺式非对映选择性。相反,更强的碱(KO t -Bu)通过消除磺酰基和硼基基团,进一步促进反应形成( E )-跳过的二烯。
Visible-Light-Mediated C–I Difluoroallylation with an α-Aminoalkyl Radical as a Mediator
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.1c02905
日期:2021.9.17
for direct visible-light-mediated C–I difluoroallylation reactions of α-trifluoromethyl arylalkenes with alkyliodides at room temperature with an α-aminoalkyl radical as a mediator. The protocol permits efficient functionalization of various α-trifluoromethyl arylalkenes with cyclic and acyclic primary, secondary, and tertiary alkyliodides and is scalable to the gram level. This mild protocol uses
Visible-light-mediated alkylation of 4-alkyl-1,4-dihydropyridines with alkenyl sulfones
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d1ob01806j
日期:——
Herein we report a mild, general protocol for visible-light-mediated alkylation of 4-alkyl-1,4-dihydropyridines with alkenyl sulfones. The protocol permits efficient functionalization of sulfones with a broad range of cyclic and acyclic secondary and tertiary alkyl groups and is scalable to the gram level. Its excellent functional group tolerance and mildness make it suitable for late-stage functionalization
Alkenylation and allylation of alkyl iodides with alkenyl and allylsulfones, respectively, took place under Pd/photoirradiation system. The initial alkyl radical, derived from a single electron transfer between Pd(0) and RI, underwent the title transformations. Pd(0) was regenerated through a reductive elimination of PhSO2PdI, which is formed by the combination of the sulfonyl radical and the palladium
Visible-Light-Mediated Alkenylation of Alkyl Boronic Acids without an External Lewis Base as an Activator
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.1c00399
日期:2021.4.2
Herein we report a protocol for the direct visible-light-mediated alkenylation of alkyl boronic acids at room temperature without an external Lewis base as an activator, and we propose a mechanism involving benzenesulfinate activation of the alkyl boronic acids. The protocol permits the efficient functionalization of a broad range of cyclic and acyclic primary and secondary alkyl boronic acids with
Visible-Light-Mediated Alkenylation, Allylation, and Cyanation of Potassium Alkyltrifluoroborates with Organic Photoredox Catalysts
作者:Drew R. Heitz、Komal Rizwan、Gary A. Molander
DOI:10.1021/acs.joc.6b01207
日期:2016.8.19
and ruthenium-free approaches to protectedallylicamines and alkyl nitriles under photoredox conditions are reported. An inexpensive organic dye, eosin Y, catalyzes coupling of Boc-protected potassium α-aminomethyltrifluoroborates with a variety of substituted alkenyl sulfones through an α-aminomethyl radical addition–elimination pathway. Allylic and homoallylic amines were formed in moderate yields