Iodine/Manganese Dual Catalysis for Oxidative Dehydrogenation Coupling of Amines with Thiols
作者:Shengping Liu、Zaojuan Qi、Zhang Zhang、Bo Qian
DOI:10.1021/acs.orglett.9b02545
日期:2019.10.4
A novel dual catalytic system of iodine and manganese is used for the first time for oxidative dehydrogenation coupling of amines with thiols during aerobic oxidation. Sulfenamides are synthesized via this approach with moderate to high efficiencies. The mechanistic studies indicate that activated MnO2 is an electron transfer bridge for assisting iodine in completing the catalytic cycle.
Steric and electronic effects on the partitioning of a persulfinyl intermediate along the physical quenching and chemical reaction channels
作者:Edward L Clennan、Alexander Greer
DOI:10.1016/0040-4039(96)01300-7
日期:1996.8
rate constants, kT, kr, and kQ, corresponding to the substrate induced total removal, chemical removal, and physical removal of singlet oxygen, respectively, have been measured for a series of sulfenamides. The structural effects on the partitioning of the persulfinamide intermediatealong the chemical and physical deactivation pathways is discussed.
A sequential and efficient protocol for the synthesis of α-thiolated enaminones has been developed using copper-TEMPO systems. This reaction features a broad substrate scope to afford the desired product in good to excellent yields with high stereoselectivity. A preliminary mechanistic study suggests that the in situ formed enaminone acts as the key intermediate.
Sustainable aerobic oxidative coupling of thiols and amines for selective formation of sulfenamides using MOF-derived cobalt nanoparticles supported on N-doped carbon
carbon has been developed as a heterogeneous catalyst for aerobicoxidative S–N coupling. This catalytic system allows for the efficient and selective transformation of various thiols and amines to sulfenamides with moderate to high yields. The catalyst can be recycled for six consecutive runs with negligible loss of activity. Cobalt nanoparticles were determined to be the catalytically active sites through
ZIF-67 衍生的钴基 N 掺杂碳已被开发为用于有氧氧化 S-N 偶联的多相催化剂。该催化系统允许将各种硫醇和胺以中等到高产率高效和选择性地转化为亚磺酰胺。该催化剂可以连续循环六次,活性损失可忽略不计。通过材料表征和控制实验确定钴纳米粒子是催化活性位点。初步的机理研究表明一种以二硫化物作为中间体的激进机理。
Selective Synthesis of Sulfonamides and Sulfenamides from Sodium Sulfinates and Amines
An effective method was explored for the selective synthesis of sulfonamides and sulfenamides using sodium sulfinates and amines as starting materials. This method offers mild reaction conditions, a broad substrate scope, high efficiency, and readily accessible materials, making it suitable and an alternative strategy for the preparation of a variety of biologically or pharmaceutically active compounds