The Fe-catalyzed decomposition of sulfonylhydrazones gives rise to sulfones. The reaction is quite general and allows the preparation of sulfones from a variety of aryl, alkyl, and α,β-unsaturated aldehydes and ketones. Crossover experiments reveal that the reaction is an intermolecular process, which may proceed by nucleophilic attack of the sulfinate anion on an iron carbene complex.
Recyclable Copper(I)-Catalyzed Cross-Coupling of Trialkylsilylethynes and <i>N</i>-Tosylhydrazones Leading to the Formation of C(sp)–C(sp<sup>3</sup>) Bonds
作者:Qian Ye、Wencheng Huang、Li Wei、Mingzhong Cai
DOI:10.1021/acs.joc.2c02691
日期:2023.3.3
A highly efficient heterogeneous copper(I)-catalyzed cross-coupling of trialkylsilylethynes with N-tosylhydrazones has been achieved in dioxane at 90–110 °C via the Cu carbenemigratoryinsertion with an SBA-15-immobilized l-proline-Cu(I) complex [SBA-15-l-Proline-CuI] as the catalyst and LiOtBu as the base, leading to the formation of C(sp)–C(sp3) bonds. The reaction generates a wide variety of a
通过 Cu 卡宾迁移插入和 SBA-15-固定的l-脯氨酸-Cu (I ) 络合物 [SBA-15- l -Proline-CuI] 作为催化剂和 LiO t Bu 作为碱,导致 C(sp)–C(sp 3 ) 键的形成。该反应以中高产率生成多种烷基三烷基甲硅烷基炔烃。这种新型多相铜 (I) 配合物具有与均相 CuI 相当的催化效率,并且可以通过简单的离心过程轻松回收,并且可回收多达 12 次而不会显着损失活性。
Palladium/GF-Phos-catalyzed asymmetric carbenylative amination to access chiral pyrrolidines and piperidines
作者:Yue Sun、Chun Ma、Zhiming Li、Junliang Zhang
DOI:10.1039/d2sc03999k
日期:——
but the development of catalyticenantioselective versions still poses considerable challenges and only very limited examples have been reported. We herein report an asymmetric palladium/GF-Phos-catalyzed carbenylative amination reaction of N-tosylhydrazones and (E)-vinyl iodides pendent with amine, which allows facile access to a range of chiral pyrrolidines and piperidines in good yields (45–93%)
N-甲苯磺酰腙的交叉偶联已成为构建结构多样化分子的有效方法,但催化对映选择性版本的开发仍然面临相当大的挑战,并且仅报道了非常有限的例子。我们在此报告了一种不对称钯/GF-Phos催化的N-甲苯磺酰腙和( E )-乙烯基碘化物与胺悬垂的羧基胺化反应,该反应可以轻松获得一系列手性吡咯烷和哌啶,产率良好(45-93%) ) 高达 96.5: 3.5 er 。此外,条件温和、底物范围广泛、制备规模化以及天然产物(−)-norruspoline的高效合成是该方法的实用特点。
Pd(0)-Catalyzed Carbene Insertion into Si–Si and Sn–Sn Bonds
作者:Zhenxing Liu、Haocheng Tan、Tianren Fu、Ying Xia、Di Qiu、Yan Zhang、Jianbo Wang
DOI:10.1021/jacs.5b09135
日期:2015.10.14
The first Pd(0)-catalyzed carbene insertion into Si-Si and Sn-Sn bonds has been realized by using N-tosylhydrazones as the carbene precursors. Geminal bis(silane) and geminal bis(stannane) derivatives were obtained in good to excellent yields under mild conditions. Migratory insertion of Pd carbene is supposed to be the key step for the reaction.