Nitrosonium ion catalysis: aerobic, metal-free cross-dehydrogenative carbon–heteroatom bond formation
作者:Luis Bering、Laura D’Ottavio、Giedre Sirvinskaite、Andrey P. Antonchick
DOI:10.1039/c8cc08328b
日期:——
coupling of heteroarenes with thiophenols and phenothiazines has been developed under mild and environmentally benign reaction conditions. For the first time, NOx+ was applied for catalytic C–S and C–N bond formation. A comprehensive scope for the C–H/S–H and C–H/N–H cross-dehydrogenative coupling was demonstrated with >60 examples. The sustainable cross-coupling conditions utilize ambient oxygen as the
杂芳烃与硫酚和吩噻嗪的催化交叉脱氢偶联已在温和且环境友好的反应条件下得到发展。首次将NO x +用于催化C–S和C–N键的形成。用60多个例子证明了C–H / S–H和C–H / N–H交叉脱氢偶联的综合范围。可持续的交叉偶联条件利用环境氧作为末端氧化剂,而水是唯一的副产物。
been developed for dehydrogenative C−H/S−H cross‐coupling. This method enabled C−S bond formation under catalyst‐ and oxidant‐free conditions. Under undivided electrolysis conditions, various aryl/heteroaryl thiols and electron‐rich arenes afforded the C−S bond‐formation products in 24–99 % yield. A preliminary mechanistic study indicated that the generation of aryl radicalcation intermediates is key
Flavin–iodine coupled organocatalysis for the aerobic oxidative direct sulfenylation of indoles with thiols under mild conditions
作者:Ryoma Ohkado、Tatsuro Ishikawa、Hiroki Iida
DOI:10.1039/c8gc00117k
日期:——
A unique coupled redox organocatalysis system using flavin and iodine catalysts efficiently promoted the metal-free aerobic oxidative direct sulfenylation of indoles with thiols at ambient temperature without any sacrificial reagents, except environmentally benign molecular oxygen. Biomimetic flavin catalysis plays multiple roles in aerobic oxidative transformations, not only regenerating I2 from in
Photocatalytic direct C–S bond formation: facile access to 3-sulfenylindoles via metal-free C-3 sulfenylation of indoles with thiophenols
作者:Wei Guo、Wen Tan、Mingming Zhao、Kailiang Tao、Lv-Yin Zheng、Yongquan Wu、Deliang Chen、Xiao-Lin Fan
DOI:10.1039/c7ra08086g
日期:——
An efficient and convenient photocatalytic direct C-3 sulfenylation of indoles with thiophenols has been developed for the construction of 3-sulfenylations. This protocol employs thiophenols as the sulfenylating agents, inexpensive rose bengal as the photocatalyst, and shows mild conditions, readily available starting materials, high atom and step atom economy, and environmental advantages. The representative
Visible light-induced 3-sulfenylation of N-methylindoles with arylsulfonyl chlorides
作者:Min Chen、Zhi-Tang Huang、Qi-Yu Zheng
DOI:10.1039/c2cc36866h
日期:——
The synthesis of 1-methyl-3-(arylthio)-1H-indoles has been achieved by the photoredox reaction of N-methylindoles with readily available arylsulfonyl chlorides in moderate yields.