Straightforward Synthesis of Nonconjugated Cyclohex-3-enone and Conjugated 4-Methylenecyclohex-2-enone Derivatives
作者:Gerhard Hilt、Julian Kuttner、Svenja Warratz
DOI:10.1055/s-0031-1289752
日期:2012.5
The synthesis of nonconjugated cyclohex-3-enones via the regiodivergent cobalt-catalysed Diels-Alder reactions of 2-(trimethylsilyloxy)buta-1,3-diene with alkynes and hydrolysis of the dihydroaromatic intermediates is described. The application of bidentate phosphine ligands versus pyridine-imine ligands led to the regioselective formation of one out of the two possible regioisomeric products when
Pd-Catalyzed oxidative isomerization of propargylic acetates: highly efficient access to α-acetoxyenones <i>via</i> alkenyl Csp<sup>2</sup>–O bond-forming reductive elimination from Pd<sup>IV</sup>
作者:Jun Li、Wenjie Yang、Fachao Yan、Qing Liu、Ping Wang、Yueyun Li、Yi Zhao、Yunhui Dong、Hui Liu
DOI:10.1039/c6cc04463h
日期:——
Described is a Pd(II)/(IV)-catalyzed Oxidative isomerization of propargylic acetates developed for the synthesis of polysubstituted alkenyl acetates. The reductive elimination of alkenyl Csp2-OAc bond from PdIV intermediates is achieved. Mechanistic...
A sequential Rh(III)-catalyzed C-H activation/annulation of N-hydroxybenzamides with propargylic acetates leading to the formation of NH-free isoquinolones is described. This reaction proceeds through a sequential C-H activation/alkyne insertion/intramolecular annulation/N-O bond cleavage procedure, affording a broad spectrum of products with diverse substituents in moderate-to-excellent yields. Notably
Nonclassical Arylative Meyer–Schuster Rearrangement through Ni-Catalyzed Inner-Sphere Acyloxy Migration
作者:Jaehan Bae、Wooin Lee、Ho Seong Hwang、Seoyeon Kim、Jihee Kang、Naeem Iqbal、Eun Jin Cho
DOI:10.1021/acscatal.3c02374
日期:2023.8.18
A Ni(II)-catalyzed unconventional Meyer–Schuster rearrangement (MSR) is paired with cross-coupling through inner-sphere acyloxy migration. Various propargyl acetates react with aryl boronic acids, leading to the formation of a range of α-arylated enone derivatives. This transformation is enabled by the use of a P∧N-type phosphinooxazoline (PHOX) ligand, which allows the substrate to coordinate with
Ni(II) 催化的非常规迈耶-舒斯特重排 (MSR) 通过内球酰氧基迁移与交叉偶联配对。各种乙酸炔丙酯与芳基硼酸反应,形成一系列 α-芳基化烯酮衍生物。这种转变是通过使用 P ∧ N 型膦基恶唑啉 (PHOX) 配体实现的,该配体允许底物与方形平面 Ni(II) 中心配位。它引发炔部分的芳基镍化,然后进行乙酸基团的分子内转位。这种非经典方法允许在 α 位添加富电子亲核试剂,而不需要氧化还原添加剂。一系列对照实验包括18O同位素标记研究和计算分析证实了内球酰氧基迁移。