摘要 二硫缩醛化是一类众所周知的有机转化,通过 1,2-乙二硫醇/或 1 来保护多种芳香族化合物(具有释放电子和吸电子取代基)、杂芳香族和脂肪族醛以及酮。 ,3-丙二硫醇在 Fe 3 O 4 @MCM-41-GPTMS-Gu-Cu II NP存在下。在 Fe 3 O 4 @MCM-41-GPTMS-Gu-Cu II存在下化学选择性地获得了相应的 1,3-二硫杂环己烷和 1,3-二噻烷纳米颗粒具有六方核壳结构、超顺磁性,在温和的反应条件下平均粒径为8-25 nm。使用磁棒可以轻松地将纳米结构催化剂从反应混合物中分离出来,并在多次反应中重复使用,而不会显着降低其催化活性。接近中性的条件、良好至高的产物收率、操作简单、后处理程序容易、与各种官能团的相容性使得本方法除了已知的方法之外还有价值。
Perchloric Acid Adsorbed on Silica Gel (HClO<sub>4</sub>-SiO<sub>2</sub>) as an Extremely Efficient and Reusable Catalyst for 1,3-Dithiolane/Dithiane Formation
作者:Asit Chakraborti、Santosh Rudrawar、Ram Besra
DOI:10.1055/s-2006-942474
日期:2006.8
Perchloric acid adsorbed on silicagel (HClO 4 -SiO 2 ) has been found to be an extremely efficient and reusable catalyst for 1,3-dithiolane and 1,3-dithiane formation under solvent-free conditions at room temperature.
Copper(II) tetrafluoroborate as an extremely efficient catalyst for 1,3-dithiolane/dithiane formation from carbonyl compounds under solvent-free conditions at room temperature
作者:Ram C. Besra、Santosh Rudrawar、Asit K. Chakraborti
DOI:10.1016/j.tetlet.2005.07.059
日期:2005.9
formation from aromatic, heteroaromatic and aliphatic aldehydes and cyclic saturated ketones in 1–5 min under solvent-free conditions at room temperature. The reaction is compatible with other functionalities such as ether, ester, hydroxyl, halide, nitro and cyano groups and exhibits excellent chemoselectivity. α,β-Unsaturated aldehydes/ketones lead to selective formation of 1,3-dithiolanes instead of
One-pot two-step conversion of aromatic carboxylic acids and esters to aromatic aldehydes via indium-catalyzed reductive thioacetalization and desulfurization
作者:Norio Sakai、Kohei Minato、Yohei Ogiwara
DOI:10.1016/j.tetlet.2017.10.050
日期:2017.11
herein is that a new approach to a one-pot two-step conversion of aromatic carboxylic acids/esters to aromaticaldehydes, in which indium(III) iodide effectively catalyzes both the first reductive thioacetalization of carboxylic acids and a subsequent desulfurization of the in-situ formed thioacetal intermediates leading to aldehydes.
An atom-economical diastereoselective synthesis of indenodithiepines and indenodithiocines has been developed via a domino reaction of propargylicalcohols and dithioacetals in the presence of InCl3 as a catalyst. A range of functionalized dithiepines and dithiocines, fused to the indene ring, were obtained in good to excellent yields under mild conditions.
Silica Gel-Supported Polyphosphoric Acid (PPA/SiO<sub>2</sub>) as an Efficient and Reusable Catalyst for Conversion of Carbonyl Compounds into Oxathioacetals and Dithioacetals
作者:Tadashi Aoyama、Toshio Takido、Mitsuo Kodomari
DOI:10.1055/s-2004-832812
日期:——
A simple and efficient method for the conversion of carbonyl compounds to oxathioacetals and dithioacetals by using polyphosphoric acid supported on silica gel (PPA/SiO2) as an acid catalyst have been developed. PPA/SiO2 is easily recovered from the reaction mixture and reused without a decrease in catalytic activity.