Conversion of Epoxides to 1,3-Dioxolanes Catalyzed by Tin(II) Chloride
摘要:
Anhydrous tin(II) chloride is an efficient catalyst for the reaction of epoxides with acetone to prepare 2,2-dimethyl-1,3-dioxolanes (acetonides) in good to excellent yields. Mono-, di-, and trisubstituted epoxides participate equally well in this diastereospecific reaction. The use of single enantiomer epoxides under the reported conditions results in significant erosion of optical activity.
Hypervalent Iodine as a Terminal Oxidant in Wacker-Type Oxidation of Terminal Olefins to Methyl Ketones
作者:Dipali A. Chaudhari、Rodney A. Fernandes
DOI:10.1021/acs.joc.6b00137
日期:2016.3.4
the Wacker process for C═O bond formation in terminal olefins can be initiated by a combination of the Pd(II) and hypervalentiodinereagent, Dess–Martin periodinane to generate methyl ketones. This operationally simple and scalable method offers Markovnikov selectivity, has good functional group compatibility, and is mild and high yielding.
Iron(III) Sulfate as Terminal Oxidant in the Synthesis of Methyl Ketones via Wacker Oxidation
作者:Rodney A. Fernandes、Dipali A. Chaudhari
DOI:10.1021/jo500921j
日期:2014.6.20
An efficient and environmentally benign method using Fe(III) sulfate as a terminal oxidant in the synthesis of methylketones from terminal olefins via the Wacker process is developed. The methodology offers high selectivity for a Markonikov product, shows good functional group compatibility, involves mild reaction conditions, and is operationally simple. Fe2(SO4)3 is the sole terminal oxidant in this
Synthesis of methyl ketones from terminal olefins using PdCl2/CrO3 system mimicking the Wacker process
作者:Rodney A. Fernandes、Venkati Bethi
DOI:10.1016/j.tet.2014.05.022
日期:2014.8
An efficient synthesis of methyl ketones from terminalolefinsusing PdCl2/CrO3 system mimicking the Wacker process is developed. The method shows good functional groups compatibility, no aldehyde by-products and is operationally simple. CrO3 is the sole oxidant and replaces both Cu-salts and molecularoxygen, traditionally used in this process. The method holds potential for future applications in
A Direct, Straightforward Conversion of Methoxymethyl Ethers into Acetates
作者:M. P. Bosch、I. Petschen、A. Guerrero
DOI:10.1055/s-2000-6258
日期:——
The direct transformation of MOM-protected alcohols into the corresponding acetates by acetic anhydride/ferric chloride in CH2Cl2, in a one-step process and good to excellent yields, is reported. The reaction has been applied to a variety of substrates and occurs with retention of configuration.
developed for the synthesis of aliphatic fluorinated methyl ethers (ROCH2RF), specifically monofluoromethyl ethers (ROCH2F) and trifluoromethylthiomethyl ethers (ROCH2SCF3), through pyridinium-type salt intermediates derived from methoxymethyl (MOM) ethers. The addition of a fluorine source (F− or SCF3−) to the pyridinium-type salts afforded the corresponding fluorinated methyl ethers in good yields under