Base-Induced Highly Regioselective Synthesis of <i>N</i><sup>2</sup>-Substituted 1,2,3-Triazoles under Mild Conditions in Air
作者:Jian Ji、Cong Guan、Qinghua Wei、Xuwen Chen、Yun Zhao、Shunying Liu
DOI:10.1021/acs.orglett.1c03743
日期:2022.1.14
We developed a highly regioselective base-induced synthesis of N2-substituted 1,2,3-triazoles from N-sulfonyl-1,2,3-triazoles and alkyl bromides/alkyl iodides at room temperature. We propose an SN2-like mechanistic pathway to explain the high N2-regioselectivity. The protocol features a broad substrate scope and generates products in good to excellent yields (72–90%).
我们开发了一种在室温下由N-磺酰基-1,2,3-三唑和烷基溴/烷基碘合成N 2 -取代的 1,2,3-三唑的高度区域选择性碱诱导合成。我们提出了一种类似 S N 2 的机制途径来解释高N 2区域选择性。该协议具有广泛的底物范围,并以良好的产量产生产品 (72–90%)。
Cascade Rh(<scp>ii</scp>) and Yb(<scp>iii</scp>) catalyzed synthesis of substituted naphthofurans <i>via</i> transannulation of <i>N</i>-sulfonyl-1,2,3-triazoles with β-naphthols
An efficient cascade Rh(II) and Yb(III) catalyzed transannulation of N-sulfonyl-1,2,3-triazoles with β-naphthols has been accomplished for the synthesis of substituted naphthofurans in good yields. The reaction involves the initial rhodium catalyzed insertion of azavinyl carbene into the O–H bond followed by ytterbium catalyzed annulative C–C bond formation and concomitant aerial oxidation. The developed
derivatives has been accomplished from aniline-derived 1,3-aminoalcohols and N-sulfonyl-1,2,3-triazole. The developed reaction demonstrates the new reactivity of azavinyl carbenes and allows access to diverse substituted dihydro-3,1-benzoxazines in good yields. Importantly, the reaction was readily extended to diols and could be used for selective protection of amino alcohols with N-sulfonyl-1,2,3-triazole
Highly Regioselective Radical Transformation of <i>N</i>-Sulfonyl-1,2,3-triazoles in Air
作者:Zi Li、Qinghua Wei、Longlong Song、Wangyujing Han、Xiang Wu、Yun Zhao、Fei Xia、Shunying Liu
DOI:10.1021/acs.orglett.9b02269
日期:2019.8.16
The classic transformations of N-sulfonyl-1,2,3-trazoles were processed via nitrogen anion (hydrolysis, etc.) and carbene intermediates, and no efficient examples via radical intermediates were developed. Here, we reported a catalyst-free radical chain transformation of N-sulfonyl-1,2,3-triazoles to access an intermolecular oxidative C(sp(3))-H coupling to yield N-2-selective products in air without any catalysts.