Direct synthesis of thioethers from sulfonyl chlorides and activated alcohols
作者:Michael T Martin、Alford M Thomas、Douglas G York
DOI:10.1016/s0040-4039(02)00218-6
日期:2002.3
An efficient, safe one-pot synthesis of thioethers from aromatic sulfonylchlorides and activated alcohols has been developed under non-aqueous conditions.
在非水条件下,已经开发了由芳族磺酰氯和活化的醇高效,安全地一锅合成硫醚的方法。
Catalytic behavior of phenols in pyrolytic conversion of allylic dithiolcarbonates to allylic sulfides.
Pyrolytic conversion of S-(2-alkenyl) S-alkyl dithiocarbonates (allylic dithiolcarbonates) to 2-alkenyl alkyl sulfides (allylic sulfides) was catalyzed by phenols bearing electron-attracting substituents. The reaction is pseudo-first-order and the apparent first-order rate constants are proportional not only to the concentration of phenols but also to the hydrogen-bonding capability of phenols. The entropy of activation for the phenol-catalyzed reaction is ca. 8 e.u. smaller than that for the uncatalyzed reaction. The reactivity of S-(1-phenylallyl) S-alkyl dithiocarbonates did not obey Hammett's or Taft's equation. Based on these findings together with the MNDO (modified neglect of diatomic overlap) calculation data, a possible role of phenols in the pyrolytic conversion of allylic dithiolcarbonates to allylic sulfides is discussed.
Asymmetric dihydroxylation of olefins containing sulfur: Chemoselective oxidation of CC double bonds in the presence of sulfides, 1,3-dithianes, and disulfides
作者:Patrick J. Walsh、Pui Tong Ho、S.Bruce King、K.Barry Sharpless
DOI:10.1016/s0040-4039(00)77045-6
日期:1994.7
tetroxide catalyzed oxidation of sulfide containing olefins in the presence of the chiral ligands (DHQD)2PHAL and (DHQ)2PHAL resulted in the chemoselective oxidation of the CC double bond rather than oxidation at sulfur. The enantioselectivity is dependent on the substitution pattern of the olefin and ranges from 61–98%. The AD can be performed in the presence of the disulfide and 1,3-dithiane functional
Diastereoselective sulfur ylide rearrangements from gold catalyzed oxidation of ynamides
作者:Joshua D. Priest、Louise Male、Paul W. Davies
DOI:10.1016/j.tet.2020.131757
日期:2021.1
two contiguous stereocentres. Low diastereoselectivity is typically observed from commonly used α-diazocarboxylic ester precursors. High diastereoselectivity was previously revealed in a gold-catalyzed multicomponent route into allyl sulfonium ylides by reaction of ynamide, oxidant and allyl sulfides. The effect of substrate modifications on the diastereoselectivity have been studied, with N-phenyl
Novel Tandem Conjugate Addition-Ramberg-Bäcklund Rearrangements
作者:Paul Evans、Richard Taylor
DOI:10.1055/s-1997-1540
日期:1997.9
A novel tandem process is reported for the preparation of allylic amines, ethers and sulfides from α-bromo-α,β-unsaturated sulfones; this process is believed to proceed via an initial conjugate addition followed by proton exchange and Ramberg-Bäcklund rearrangement.