TiCl<sub>4</sub>-promoted desulfurization of thiocarbonyls and oxidation of sulfides in the presence of H<sub>2</sub>O<sub>2</sub>
作者:Kiumars Bahrami、Mohammad M. Khodaei、Vida Shakibaian、Donya Khaledian、Behrooz H. Yousefi
DOI:10.1080/17415993.2011.647915
日期:2012.4.1
TiCl4 proved to be a highly reactive reagent system for the desulfurization of thioamide and thioketone derivatives in excellent yields and short reaction times with high purity. Sulfides were also found to undergo oxidation to sulfones under similar reaction conditions. In most cases, these reactions are highly selective, simple, and clean, affording products in high yields and purity.
Three-componentreactions involving amines, aldehydes, and elemental sulfur powder are reported to afford thioamides in a simple one-pot procedure in the absence of a catalyst. A variety of thioamides can be obtained in good to excellent yields up to 88 %.
H2O2/SOCl2: a useful reagent system for the conversion of thiocarbonyls to carbonyl compounds
作者:Kiumars Bahrami、Mohammad M. Khodaei、Azita Farrokhi
DOI:10.1016/j.tet.2009.06.110
日期:2009.9
The H2O2/SOCl2 reagent system has been used as a new and efficient reagent for deprotection of thiocarbonyls to carbonyl compounds. The salient features of this protocol are short reaction times, good chemoselectivity, clean reaction profiles, and simple work-up that preclude the use of toxic solvents. (C) 2009 Elsevier Ltd. All rights reserved.
Copper-catalyzed oxidative benzylic C(sp<sup>3</sup>)–H amination: direct synthesis of benzylic carbamates
A new efficient strategy to access benzylic carbamates through C–H activation is reported. The use of a catalytic amount of a Cu(I)/diimine ligand in combination with NFSI ((PhSO2)2NF) or F-TEDA-PF6 as oxidants and H2NCO2R as an amine source directly leads to the C–N bond formation at the benzylic position. The mild reaction conditions and the broad substrate scope make this transformation a useful