Silver-promoted cascade radical cyclization of γ,δ-unsaturated oxime esters with P(O)H compounds: synthesis of phosphorylated pyrrolines
作者:Chen Chen、Yinwei Bao、Jinghui Zhao、Bolin Zhu
DOI:10.1039/c9cc08124k
日期:——
A cascade radicalcyclization was realized for the first silver-promoted imino-phosphorylation of γ,δ-unsaturated oxime esters, which provided a step-economical and redox-neutral route to access a variety of phosphorylated pyrrolines in good to excellent yields. Moreover, a new bulky trivalent phosphine ligand with a pyrroline motif was obtained through a deoxidation process.
TEMPO-mediated allylic C–H amination with hydrazones
作者:Xu Zhu、Shunsuke Chiba
DOI:10.1039/c4ob00839a
日期:——
TEMPO-mediated reactions of alkenyl hydrazones afforded azaheterocycles via sp3 C–H allylic amination. The transformation is featured by a sequence of remote allylic H-radical shift and allylic homolytic substitution with hydrazone radicals.
Allylations of aryl/heteroaryl ketones: neat, clean, and sustainable. Applications to targets in the pharma- and nutraceutical industries
作者:Xiaohan Li、Alex B. Wood、Nicholas R. Lee、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1039/d2gc00776b
日期:——
Aromatic and heteroaromatic ketones bearing an α-methine proton can be deprotonated and mono-allylated in minutes in the complete absence of an organic solvent to arrive at the corresponding products in high isolated yields. Applications to synthetic targets including both MK-7 and MK-9, as well as coenzyme Q9 (CoQ9), utilizing this new technology are documented.
reductive cross-coupling of unsaturated oxime esters with readily available arylhalides, providing an expedient approach for constructing pyrroline derivatives. The absence of organometallic reagents enables the reaction to occur under mild conditions with a broad substrate scope and good functional group tolerance. Moreover, other C-based electrophiles, including alkenyl, alkynyl and alkylhalides, or
在此,我们公开了通过镍催化的不饱和肟酯与容易获得的芳基卤化物的还原交叉偶联对烯烃进行一般且实用的亚氨基化,为构建吡咯啉衍生物提供了一种权宜之计。不存在有机金属试剂使反应能够在温和的条件下发生,具有广泛的底物范围和良好的官能团耐受性。此外,其他基于 C 的亲电子试剂,包括烯基、炔基和烷基卤化物或假卤化物,也是该反应的合适底物。
Visible-Light-Induced Difunctionalization of Alkenyl Ketones with α-Carbonyl Alkyl Bromide: Concomitant Installation of C–C Bonds
The visible-light-promoted difunctionalization of alkenyl ketones has been developed for easyaccess of various tetralones, cyclopropane, or alkenyl migration compounds. With fac-[Ir(ppy)3] as the photocatalyst, alkenyl ketones captured the α-carbonyl alkyl radical and evolved through intramolecular cyclization and the elimination of a proton to give the difunctionalized products. This strategy is