A Simple and Practical Synthetic Protocol for Acetalisation, Thioacetalisation and Transthioacetalisation of Carbonyl Compounds under Solvent-Free Conditions
作者:Abu T. Khan、Ejabul Mondal、Subrata Ghosh、Samimul Islam
Pr(OTf)<sub>3</sub> as an Efficient and Recyclable Catalyst for Chemoselective Thioacetalization of Aldehydes
作者:Surya De
DOI:10.1055/s-2004-834858
日期:——
Praseodymium triflate has been found to be an efficient and recyclable catalyst for chemoselective protection of aldehydes.
三氟甲磺酸镨已被发现是一种高效且可循环的催化剂,适用于醛的选择性保护反应。
Simple, Mild and Efficient Thioacetalization and Transthioacetalization of Carbonyl Compounds and Deprotection of Thioacetals: Unique Role of Thiols in the Selectivity of Thioacetalization
Silicasupportedsodiumhydrogen sulfate (NaHSO 4 .SiO 2 ) has been employed for efficient thioacetalization and transthioacetalization of carbonyl compounds in CH 2 Cl 2 at room temperature. Selectivity of thioacetalization was dependent on the thiols used for the conversion. The same catalyst was also found to be effective for deprotection of thioacetals in CH 2 Cl 2 -H 2 O at room temperature.
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