Primary, Secondary, and Tertiary γ-C(sp<sup>3</sup>)–H Vinylation of Amides via Organic Photoredox-Catalyzed Hydrogen Atom Transfer
作者:Hui Chen、Liangliang Guo、Shouyun Yu
DOI:10.1021/acs.orglett.8b02737
日期:2018.10.5
An efficient strategy for primary, secondary and tertiary aliphatic γ-C(sp3)–H vinylation of amides with alkenylboronic acids is reported. These reactions are catalyzed by visible-light organic photoredox agents. Regioselective γ-C(sp3)–H vinylation of amides is controlled by a 1,5-hydrogen atom transfer of an amidyl radical generated in situ.
<scp>Cobalt‐Catalyzed</scp>
Enantioselec tive
<scp>Ring‐Opening</scp>
Reactions of Oxa‐ and Aza‐bicyclic Alkenes with Alkenylboronic Acids
作者:Di Zhu、Yongmei Zhao、Qinglei Chong、Fanke Meng
DOI:10.1002/cjoc.202100622
日期:2022.1.15
Catalytic enantioselective ring-opening of oxa- and aza-bicyclic alkenes with readily available accessible alkenylboronic acids, promoted by a chiral phosphine–Co complex, is reported. Such a process represents the unprecedented Co-catalyzed introduction of various alkenyl groups onto the oxa- and aza-bicyclic alkenes, affording a widerange of multisubstituted functionalized cyclohexenes in up to
据报道,在手性膦-钴配合物的促进下,氧杂和氮杂双环烯烃与容易获得的烯基硼酸催化对映选择性开环。这样的过程代表了前所未有的将各种烯基引入氧杂-和氮杂-双环烯烃上,以高达 98% 的收率和 99.5:0.5 er 提供范围广泛的多取代官能化环己烯。
A photocatalytic multi‐component radical relay reaction has been developed for the stereodivergent synthesis of both stereoisomers of α‐aminomethyl cinnamyl ethers. The radical relay reaction of hydroxylamine derivatives, enol ethers and alkenyl boronic acids in DMSO under white LEDs could lead to E‐isomers of α‐aminomethyl cinnamyl ethers. The E‐isomers could subsequently isomerize to less thermodynamically
Deaminative metal-free reaction of alkenylboronic acids, sodium metabisulfite and Katritzky salts
作者:Tonghao Zhu、Jia Shen、Yuyuan Sun、Jie Wu
DOI:10.1039/d0cc07632e
日期:——
observed and sodium metabisulfite is used as the source of sulfur dioxide. Mechanistic studies show that the alkyl radical generated in situ from Katritzky salt via a single electron transfer with alkenylboronic acid or DIPEA is the key step for providing an alkyl radical intermediate, which undergoes further alkylsulfonylation with sulfur dioxide.
construction of a rich chemical space of arylethylamine motif. In this report, a practical protocol for the synthesis of arylethylamine functionality common in pharmaceutical chemicals has been developed. It proceeds by Mn-catalyzed anti-Markovnikov hydroarylation of electron-rich enamides under mild conditions without the use of ligands. In spite of mismatched electronic effects during the manganese-mediated