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.
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
Visible light-mediated metal-free alkyl Suzuki–Miyaura coupling of alkyl halides and alkenylboronic acids/esters: a green method for the synthesis of allyl difluoride derivatives
作者:Chuan-Hua Qu、Xiao Yan、Shu-Ting Li、Jian-Bo Liu、Zhi-Gang Xu、Zhong-Zhu Chen、Dian-Yong Tang、Huan-Xiang Liu、Gui-Ting Song
DOI:10.1039/d3gc00368j
日期:——
metal residues in this process are an unavoidable challenge. Herein, we report the first visible-light-driven photocatalyst-free coupling reaction of alkenylboronic acids/esters with α-bromodifluoroacylarenes, providing streamlining access to a series of Suzuki coupling products. The reactions proceed under metal-free conditions with a wide substrate scope. Mechanistic experiments and DFT calculation
Synthesis of Skipped Aminodienes by a <scp>Ni‐Catalyzed Ring‐Opening</scp>/<scp>Cross‐Coupling</scp> Reaction of Vinylaziridines with Multifunctional Organoboronic Acids<sup>†</sup>
developed the first nickel-catalyzed regio-, (E)-stereo- and linear-selective ring-opening/cross-coupling reaction of vinylaziridines with organoboronic acids under mild conditions to construct various skipped aminodienes. The reaction exhibits wide functional-group compatibility, and could be adapted for the introduction of skipped aminodiene functionality into bioactive molecules. In addition, the reaction
跳过二烯非常重要,但由于两种烯烃之间存在 sp 3杂化碳,其合成仍然具有挑战性。在此,我们开发了第一个镍催化的乙烯基氮丙啶与有机硼酸在温和条件下的区域、( E )-立体和线性选择性开环/交叉偶联反应,以构建各种跳跃氨基二烯。该反应表现出广泛的官能团兼容性,并且可以适用于将跳过的氨基二烯官能团引入生物活性分子中。此外,该反应可以在克级规模上进行,以高产率和线性选择性(90%产率,l:b>20:1)提供开环产物。此外,DFT 计算和机制实验提供了对该机制的详细见解。
Stereoselective Fluorosulfonylation of Vinylboronic Acids for (<i>E</i>)-Vinyl Sulfonyl Fluorides with Copper Participation
A practical synthetic method for the synthesis of vinyl sulfonyl fluorides through copper-promoted direct fluorosulfonylation has been developed. The reaction of the vinylboronic acids with DABSO and then NFSI is performed under mild reaction conditions. This transformation efficiently affords aryl or alkyl vinyl sulfonyl fluorides with good reaction yields, exclusive E-configuration, broad substrate