site‐selective α‐functionalization of sulfonylamide derivatives through the in‐situ generation of imine intermediates. The N−F sulfonylamides, which could facilitate the elimination to generate imines, are coupled with TBACN to efficiently and mildly afford α‐amino cyanides. Comparing with Strecker reaction, this transformation offers a complementary strategy to efficiently construct α‐amino cyanides
Iron-Catalyzed, Site-Selective Difluoromethylthiolation (−SCF<sub>2</sub>H) and Difluoromethylselenation (−SeCF<sub>2</sub>H) of Unactivated C(sp<sup>3</sup>)–H Bonds in <i>N</i>-Fluoroamides
作者:Hongwei Zhang、Fei Yu、Chuang Li、Peiyuan Tian、Yulu Zhou、Zhong-Yan Cao
DOI:10.1021/acs.orglett.1c01443
日期:2021.6.18
The iron-catalyzed δ-C(sp3)–H bond difluoromethylthiolation and difluoromethylselenation of aliphatic amides with high site selectivity are reported. Essential to the success is the employment of an amide radical formed in situ to activate the inert C(sp3)–H bond and the utilization of the easily handled PhSO2SCF2H and PhSO2SeCF2H as coupling reagents under mild conditions. This scalable protocol exhibits
报道了铁催化的 δ-C(sp 3 )-H 键二氟甲硫基化和脂肪族酰胺的二氟甲基硒化,具有高位点选择性。成功的关键是使用原位形成的酰胺自由基来激活惰性 C(sp 3 )-H 键,并在温和条件下使用易于处理的 PhSO 2 SCF 2 H 和 PhSO 2 SeCF 2 H 作为偶联剂. 这种可扩展的协议展示了具有多功能功能组的广泛基板范围。机理研究表明,反应通过-SCF 2 H 和-SeCF 2 H 自由基转移进行。
Remote Directed Isocyanation of Unactivated C(sp<sup>3</sup>)–H Bonds: Forging Seven-Membered Cyclic Ureas Enabled by Copper Catalysis
site-selective δ-C(sp3)-Hbondsactivation of aliphatic sulfonamides for constructing the synthetically useful seven-membered N-heterocycles. A key to success is the use of in-situ-formed amide radicals, to activate the inert C(sp3)-H bond, and inexpensive TMSNCO, as a coupling reagent under mild conditions. To the best of our knowledge, this represents the first use of alkylamine derivatives as a five-membered
A general method for site-selective Csp<sup>3</sup>–S bond formation <i>via</i> cooperative catalysis
作者:Yuman Qin、Yujie Han、Yongzhen Tang、Junfa Wei、Mingyu Yang
DOI:10.1039/c9sc04169a
日期:——
Csp3–H bonds of aliphatic amines. The method features a broad substrate scope and good functional group compatibility. Primary, secondary, and tertiary C–H bonds can be converted into C–S bonds with a high efficiency. The late-stage modification of biologically active compounds by this method was also demonstrated. Furthermore, the one-pot preparation of pyrrolidine or piperidine compounds via a domino
Copper-Catalyzed, Interrupted Remote Fluoromethylthiolation of Unactivated C(sp3)-H Bonds
作者:Fan Yu、Wengui Wang、Shoufeng Wang
DOI:10.1021/acs.orglett.4c00336
日期:2024.3.15
An efficient copper-catalyzed selective fluoromethylthiolation of an inert δ-C(sp3)–H bond in sulfonamides was reported. In the presence of a copper catalyst and PhSO2SRf, the radical generated through 1,5-hydrogen atom transfer (HAT) was sufficiently trapped by PhSO2SRf, instead of copper, which was prevalent in metal-catalyzed radical-relay processes, incorporating a fluoromethylthio group into molecules
报道了磺酰胺中惰性 δ-C(sp 3 )-H 键的高效铜催化选择性氟甲基硫基化反应。在铜催化剂和PhSO 2 SR f的存在下,通过1,5-氢原子转移(HAT)产生的自由基被PhSO 2 SR f充分捕获,而不是金属催化自由基继电器中普遍存在的铜。过程,将氟甲硫基结合到分子中。通用的底物范围和温和的条件使该方法在医药和农用化学品中具有广泛的潜在应用。