Copper‐Catalyzed Remote C(sp
<sup>3</sup>
)−H Trifluoromethylation of Carboxamides and Sulfonamides
作者:Zhonglin Liu、Haiwen Xiao、Benxiang Zhang、Haigen Shen、Lin Zhu、Chaozhong Li
DOI:10.1002/anie.201813425
日期:2019.2.18
catalyst, the reaction of N‐fluoro‐substituted carboxamides (or sulfonamides) with Zn(CF3)2 complexes provides the corresponding δ‐trifluoromethylated carboxamides (or sulfonamides) in satisfactory yields under mild reaction conditions. A radical mechanism involving 1,5‐hydrogen atom transfer of N‐radicals followed by CF3‐transfer from CuII−CF3 complexes to the thus formed alkyl radicals is proposed.
本文报道的是未活化的脂族C(sp 3)-H键的三氟甲基化的空前协议。以Cu(OTf)2为催化剂,N-氟取代的羧酰胺(或磺酰胺)与Zn(CF 3)2配合物的反应在温和的反应条件下以令人满意的收率提供了相应的δ-三氟甲基化的羧酰胺(或磺酰胺)。提出了一种自由基机理,涉及N自由基的1,5-氢原子转移,然后从Cu II -CF 3络合物向如此形成的烷基自由基进行CF 3-转移。
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。