Nickel/Photoredox Dual Catalytic Cross-Coupling of Alkyl and Amidyl Radicals to Construct C(sp<sup>3</sup>)–N Bonds
作者:Shaofang Zhou、Kang Lv、Rui Fu、Changlei Zhu、Xiaoguang Bao
DOI:10.1021/acscatal.1c00731
日期:2021.5.7
The construction of C(sp3)–N bonds via direct radical–radical cross-coupling under benign conditions is a desirable but challenging approach. Herein, the cross-coupling of alkyl and amidyl radicals to build aliphatic C–N bonds in a concise, mild, and oxidant-free manner is implemented by nickel/photoredox dual catalysis. In this protocol, the single electron transfer strategy is successfully employed
在良性条件下通过直接自由基-自由基交叉偶联来构建C(sp 3)-N键是一种理想但具有挑战性的方法。在此,通过镍/光氧化还原双重催化,以简明,温和且无氧化剂的方式将烷基和and基自由基交叉偶联以建立脂族C–N键。在该协议中,成功地采用了单电子转移策略,分别从磺酰基叠氮化物/叠氮基甲酸酯和烷基三氟硼酸酯生成N-和C-中心的自由基。然而,光催化剂诱导的三重态-三重态能量转移机制可能不适用于该反应。激发的光催化剂(Ru II / * Ru II / Ru III / Ru II的氧化猝灭途径))结合可能的Ni I / Ni II / Ni III / Ni I催化循环,基于协同实验和计算研究,提出了镍/光氧化还原双催化C(sp 3)–N键形成的方法。
Metal-free I<sub>2</sub>O<sub>5</sub>-mediated direct construction of sulfonamides from thiols and amines
作者:Minghui Zhu、Wei Wei、Daoshan Yang、Huanhuan Cui、Leilei Wang、Guoqing Meng、Hua Wang
DOI:10.1039/c7ob00668c
日期:——
A simple and convenient method has been developed for the construction of sulfonamides via I2O5-mediated sulfonylation of amines with arylthiols. The present protocol provides an attractive approach to sulfonamides in moderate to good yields from readily accessible and easy to handle starting materials under mild and metal-free conditions.
Synthesis of Pyrrolo-/Indolo[1,2-<i>a</i>]quinolines and Naphtho[2,1-<i>b</i>]thiophenes from <i>gem</i>-Dibromovinyls and Sulphonamides
作者:Selvarangam E. Kiruthika、Avanashiappan Nandakumar、Paramasivan Thirumalai Perumal
DOI:10.1021/ol5019085
日期:2014.9.5
A highly efficient and simple route for the synthesis of pyrrolo-/indolo[1,2-a]quinolines and naphtho[2,1-b]thiophenes from gem-dibromovinyls and sulphonamides is reported. The noteworthy feature of this report is that the methodology involves a two-step protocol to synthesize tri- and tetracyclic heterocycles in a one-pot fashion through the Cu(I)-catalyzed formation of ynamide followed by a Ag(I)-assisted
报道了一种由宝石-二溴乙烯基和磺酰胺合成吡咯并//吲哚并[1,2- a ]喹啉和萘并[2,1- b ]噻吩的高效简单途径。该报告的值得注意的特点是该方法涉及两步协议,即通过一锅法通过Cu(I)催化的乙酰胺的形成,然后由Ag(I)辅助的分子内合成三环和四环杂环。氢芳基化。还研究了在固态和溶液态的吡咯并-和吲哚并[1,2- a ]喹啉的代表性实例的光物理性质。
A bifunctional strategy for N-heterocyclic carbene-stabilized iridium complex-catalyzed <i>N</i>-alkylation of amines with alcohols in aqueous media
作者:Ming Huang、Yinwu Li、Jiahao Liu、Xiao-Bing Lan、Yan Liu、Cunyuan Zhao、Zhuofeng Ke
DOI:10.1039/c8gc02298d
日期:——
2-hydroxypyridine and a thermally stable N-heterocyclic carbene ligand, an Ir-catalyzed N-monoalkylation reaction has been developed in aqueous media under base-free conditions. This reaction proceeds smoothly with high yields of various aromatic amines and sulfonamides with a wide range of primary alcohols. Experimental and computational studies revealed a metal–ligand cooperative mechanism and its thermal stability