We disclose a direct C(sp)–, C(sp2)–, and C(sp3)–H thiolation reaction using β-sulfinylesters as the versatile sulfur source. The key step of this protocol is chemoselective C–S bond cleavage of the sulfoniumsalts that are formed in situ from the corresponding alkenes, alkynes, and 1,3-dicarboxyl compounds with β-sulfinylesters. The successful capture of the acrylate byproduct supports a retro-Michael
Preliminary results concerning a conceptually novel route to chiral sulfoxides based on the asymmetric alkylation of sulfenate salts with alkyl halides mediated by a chiral phase-transfer catalyst are described. As a representative example, o-anisyl methyl sulfoxide was produced in 96% yield and with an enantiomeric excess of 58% using commercial cinchonidinium derivative 2a.
Crown Ether Complex Cation Ionic Liquids: Preparation and Applications in Organic Reactions
作者:Yingying Song、Huanwang Jing、Bo Li、Dongsheng Bai
DOI:10.1002/chem.201100112
日期:2011.7.25
cation ionicliquids (CECILs) were designed, synthesised and characterised by NMR spectroscopy, HRMS, thermogravimetric differential thermal analysis (TG‐DTA) and elemental analysis. Their applications in various organic reactions were investigated: [15‐C‐5Na][OH], [15‐C‐5Na][OAc], [18‐C‐6K][OH] and [18‐C‐6K][OAc] (15‐C‐5=[15]crown‐5; 18‐C‐6=[18]crown‐6) efficiently catalysed the Michael addition of alkenes
A general, efficient, and experimentally simple method for the generation of sulfenate salts has been developed using β-sulfinylesters as substrates. The process is based on a retro-Michael reaction, initiated by deprotonation at low temperature. Upon treatment with alkyl halides, the liberated sulfenates are subsequently converted into sulfoxides in good to excellent yield. Extension of the methodology
Reduction cleavage of S–S bond by Zn/Cp<sub>2</sub>TiCl<sub>2</sub>: Application for the synthesis of β-arylthiocarbonyl compounds
作者:Xiao Bo Xu、Xian Hong Yin、Yu Yang Zhu、Xin Hua Xu、Tao Luo、Yin Hui Li、Xiong Lu、Ling Ling Shao、Jian Gao Pan、Rong Hua Yang
DOI:10.3184/030823409x12592534682310
日期:2009.12
Diaryldisulfides were reduced efficiently by a Zn/Cp2TiCl2 system at room temperature in dry THF to give the corresponding nucleophilic sulfur anion–titanocene complex, followed by reaction with α, β-unsaturated esters (ketones or nitriles) to afford the corresponding β-arylthioesters(ketone or nitrile) in good yields.