The Preparation ofN-tert-Butyloxycarbonyl-(Boc-)Protected Sulfoximines and Sulfimines by an Iron(II)-Mediated Nitrene Transfer from BocN3 to Sulfoxides and Sulfides
yield). The sterospecificity of the reaction was demonstrated with the enantiomerically enriched substrates (R)-(+)-1b and (S)-(–)-1d which yielded the sulfoximides (R)-(+)-3b and (S)-(–)-3d with retention of configuration. Mechanistically, an intermediate (nitrene)FeIV complex is postulated as the reactive nitrenetransfer reagent which is formed from FeCl2 and BocN3. The more nucleophilic sulfides 2 reacted
Para-selective borylation of monosubstituted benzenes using a transient mediator
作者:Jie Wu、Zengwei Wang、Xiao-Yue Chen、Yichen Wu、Daoming Wang、Qian Peng、Peng Wang
DOI:10.1007/s11426-019-9652-x
日期:2020.3
versatile sulfonium salt via highly electrophilic phenoxathiine or thianthrenedication intermediate which can be readily generated from its sulfoxide with tri-fluoromethanesulfonic anhydride. Preliminary mechanistic study implied that the remarkable para selectivity might be related to the incredible electrophilicity of thianthrenedication intermediate. The versatility of this approach was demonstrated
New 2-alkylsulfinyl dithioacetates and thioacetamides have been prepared. The asymmetric synthesis of (R)-2-(cyclohexylsulfinyl)-N,N-dimethylthioacetamide from previously unreported (S)-diacetone-d-glucose cyclohexanesulfinate was achieved in excellent yield (91%) and enantiomeric excess (98%). Methyl (R)-2-(cyclohexylsulfinyl)dithioacetate (98% ee) was obtained from chiral cyclohexyl methyl sulfoxide (99% ee).
Oxidation of Thioether Ligands in Pseudotetrahedral Cyclopentadienylruthenium Complexes: Toward a New Stereoselective Synthesis of Chiral Sulfoxides<sup>1</sup>
作者:Wolfdieter A. Schenk、Jürgen Frisch、Michael Dürr、Nicolai Burzlaff、Dietmar Stalke、Roland Fleischer、Waldemar Adam、Frank Prechtl、Alexander K. Smerz
DOI:10.1021/ic961280f
日期:1997.5.1
orthorhombic system, space group P2(1)2(1)2(1) (No. 19), with a = 14.1664(13) Å, b = 15.792(2) Å, c = 17.641(2) Å, and Z = 4. 10b.0.93CH(2)Cl(2) crystallized in the orthorhombic system, space group P2(1)2(1)2(1) (No. 19), with a = 12.069(2) Å, b = 17.379(2) Å, c = 19.760(5) Å, and Z = 4. The thioethercomplexes can also be directly converted to sulfoxidecomplexes with the strong oxygen transfer reagent
ethyl, isobutyl, or isopropyl) with N-chlorosuccinimide, the corresponding 1-chloroalkyl methyl sulfoxide was predominantly formed, while addition of pyridine into the reaction system reversed the regioselectivity to give an alkyl chloromethyl sulfoxide as a major product.