A Simple and Efficient Heterogeneous Procedure for Thioacetalization of Aldehydes and Ketones
作者:Mohammed Hashmat Ali、Maria Goretti Gomes
DOI:10.1055/s-2005-865303
日期:——
A new procedure for the protection of aldehydes and ketones as thioacetals promoted by catalytic amount of p-toluene-sulfonic acid and silica gel has been developed. This procedure offers versatility, short reaction time,excellent yield, good selectivity, and flexibility in terms of choice of solvent that can be utilized in this reaction. The procedure is easy to carry out and does not require aqueous
Deprotection of Thioacetals Using K2S2O8/[bmim]Br as a Mild and Efficient Reagent under Solvent-Free Conditions
作者:Abdol R. Hajipour、Majid Mostafavi、Arnold E. Ruoho
DOI:10.1007/s00706-007-0650-1
日期:2007.6
A straightforward and effective procedure for the deprotection of thioacetals to the corresponding carbonyl compounds using potassium persulfate and the ionic liquid [ bmim ]Br undersolvent-freeconditions is reported. A variety of aliphatic and aromatic 1,3-dithiolanes or 1,3-dithanes was deprotected to the corresponding carbonyl derivatives by this procedure.
An efficient, continuous flow technique for the chemoselective synthesis of thioacetals
作者:Charlotte Wiles、Paul Watts、Stephen J. Haswell
DOI:10.1016/j.tetlet.2007.08.027
日期:2007.10
3-dithian-2-yl-phenyl]ethanone is obtained in excellent yield and purity. In addition, the generality of the technique is highlighted via the protection of numerous aldehydes and ketones affording the respective thioacetal/ketal in excellent yield (>99.1%) and purity (>99.9%), with space–time yields in the range of 0.44–1.10 g h−1.
AN EFFICIENT METHOD FOR THE THIOACETALIZATION OF CARBONYL COMPOUNDS IN THE PRESENCE OF CATALYTIC AMOUNTS OF BENZYLTRIPHENYLPHOSPHONIUM TRIBROMIDE
作者:A. R. Hajipour、S. A. Pourmousavi、A. E. Ruoho
DOI:10.1080/00304940709458596
日期:2007.8
in multi-step syntheses. Among carbonyl protecting groups, dithioacetals constitute an important class of compounds as acyl anion equivalents' or masked methylene functions in carbon-carbon bond forming reactions. They are versatile2 due to their straightforward preparation and also to their stability under basic or mildly acidicconditions. Although several methods have been reported for protection
An Efficient Method for Thioacetalization of Carbonyl Compounds in the Presence of a Catalytic Amount of Benzyltriphenylphosphonium Tribromide Under Solvent-Free Conditions
作者:Abdol R. Hajipour、Seied A. Pourmousavi、Arnold E. Ruoho
DOI:10.1080/10426500601088739
日期:2007.3.15
variety of carbonylcompounds have been successfully converted to the corresponding thioacetal derivatives in good to excellent yields on the reaction of carbonylcompounds with 1,2-ethanedithiole, 1,3-propanedithiol, and ethanethiol in the presence of catalytic amount of benzyltriphenylphosphonium tribromide under solvent-free conditions. Some of the major advantages of this method are mild reaction conditions