Anodic methoxylation of 2-acyloxy-3,3,3-trifluoropropyl sulfides was carried out in methanol containing Et3N-3HF as a supporting electrolyte and mediator using an undivided cell to provide the corresponding alpha-methoxylated products and unexpected beta-methoxylated products owing to [1,2]-rearrangement of the acyloxy group in the latter case. It was also found that the regioselectivity and diastereoselectivity of the anodic methoxylation were greatly affected by the concentration of methanol in an electrolytic solvent, electrolytic temperature, and bulkiness of acyloxy group. This is the first example of anodic methoxylation of sulfides accompanying with rearrangement of an acyloxy group. Furthermore, anodic intramolecular cyclization of 2-(t-butoxycarbonyl)oxy-3,3,3-trifluoropropyl sulfide was achieved in 0.01 M Et3N-3HF/MeCN eliminating a t-butyl cation to provide the corresponding trifluoromethylated ethylene carbonate derivative in good yield. (c) 2017 The Electrochemical Society. All rights reserved.
A facile chemoenzymatic route to enantiomerically pure oxiranes: building blocks for biologically active compounds
作者:Ulrich Goergens、Manfred P. Schneider
DOI:10.1039/c39910001064
日期:——
The enantiomerically purebuildingblocks (R)-and (S)-1–4 were prepared both by enantioselective, enzymatic hydrolysis and by acyl transfer, and subsequently converted into the corresponding enantiomerically pure oxiranes (R)- and (S)-7 and 8.
Photochemical incorporation of protic solvents by open chain olefins
作者:N. Miyamoto、H. Nozaki
DOI:10.1016/0040-4020(73)80201-7
日期:1973.1
Irradition of methyl styryl sulphoxide dissolved in MeOH, EtOH, or AcOH induces the photochemical polar addition of the solvents to afford the product, PhCH(OR)CH2SOMe, where R is Me, Et, or Ac. By-products are the corresponding sulphides, PhCH(OR)CH2SMe, and methyl styryl sulphide. Similar adducts of proticsolvents are produced upon irradiation of certain vinylic sulphides, methyl phenethynyl sulphide
Enzymatic kinetic resolution of organochalcogenides in supercritical CO2
作者:Rogério A. Gariani、Fernando A.G. Luengo、Luiz A.S. Vale、Reinaldo C. Bazito、João V. Comasseto
DOI:10.1016/j.tetlet.2011.04.073
日期:2011.6
1-(Phenylthio)-, 1-(phenylseleno)- and 1-(phenyltelluro)-propan-2-ol were efficiently resolved by CAL-B in sc-CO2. (C) 2011 Elsevier Ltd. All rights reserved.
Grudzinskaya, E. Yu.; Skorobogatova, E. V., Journal of Organic Chemistry USSR (English Translation), 1986, vol. 22, # 9, p. 1710 - 1713
作者:Grudzinskaya, E. Yu.、Skorobogatova, E. V.
DOI:——
日期:——
ENDO, TAKESHI;FUKUDA, HIROYUKI;HIROTA, MASAHIRO, J. AMER. CHEM. SOC., 1984, 106, N 14, 4035-4036