Electrochemical C–H functionalization and subsequent C–S and C–N bond formation: paired electrosynthesis of 3-amino-2-thiocyanato-α,β-unsaturated carbonyl derivatives mediated by bromide ions
作者:Li-Shuo Kang、Mi-Hai Luo、Chiu Marco Lam、Li-Ming Hu、R. Daniel Little、Cheng-Chu Zeng
DOI:10.1039/c6gc00666c
日期:——
An efficient paired electrosynthesis involving C–H functionalization and subsequent C–S and C–N bond formation has been developed.
已开发出一种效率高的配对电合成方法,涉及C-H官能化以及随后的C-S和C-N键形成。
4-Chloro-5H-1,2,3-dithiazol-5-one: a good α-thiocyanating agent for α,β-unsaturated β-amino esters
作者:Young Seok Park、Kyongtae Kim
DOI:10.1016/s0040-4039(99)01235-6
日期:1999.8
Treatment of 4-chloro-5H-1,2,3-dithiazol-5-one with 3-alkyl (or aryl)-3-amino-2-propenoate esters in DMSO at 120°C gave the corresponding 2-thiocyanated esters 4 (major) and 5-alkoxycarbonyl-4-alkyl (or aryl)-4-thiazolin-2-ones 5 (minor), whereas the esters bearing a strong electron-withdrawing group at C-3 under the same conditions afforded 5 and/or 4-substituted 5-alkoxycarbonyl-2-aminothiazoles
在120°C下于DMSO中用3-烷基(或芳基)-3-氨基-2-丙烯酸酯处理4-氯-5 H -1,2,3-二噻唑-5-酮,得到相应的2-硫氰酸酯4(主要)和5-烷氧基羰基-4-烷基(或芳基)-4-噻唑啉-2-酮5(次要),而在相同条件下在C-3带有强吸电子基团的酯得到5和/或4-取代的5-烷氧基羰基-2-氨基噻唑6,取决于吸电子基团。
Photocatalytic C–H Thiocyanation of NH<sub>2</sub>-Enaminones and the Tunable Synthetic Routes to 2-Aminothiazoles and 2-Thiazolinones
作者:Junlong Zeng、Jie-Ping Wan、Yunyun Liu
DOI:10.1021/acs.joc.2c01667
日期:2022.10.7
been realized for the first time, providing a sustainable route for the synthesis of thiocyanated NH2-enaminones. In addition, the thiocyanated enaminone products can be flexibly transformed into 2-aminothiazoles and 2-thiazolinones via a simple operation.
An electrochemical method for the C(sp2)−H thiocyanation of pyrazol-5-amines and enamines were developed in an undivided cell. A variety of thiocyanated pyrazol-5-amine and enamine derivatives were accessed in 36–91% yields, employing thiocyanate salts as electrolyte and thiocyanating reagent. Moreover, this electrochemical protocol can be extended to the synthesis of various iodinated and brominated