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.
Visible-light mediated facile dithiane deprotection under metal free conditions
作者:Pankaj D. Dharpure、Anindita Bhowmick、Prakash K. Warghude、Ramakrishna G. Bhat
DOI:10.1016/j.tetlet.2019.151407
日期:2020.1
Visible light mediatedfacile and selective dithiane deprotection under metal free conditions is developed. Eosin Y (1 mol%) proved to be an effective catalyst for the dithiane deprotection under the ambient photoredox conditions. The standard household compact fluorescent light source (CFL bulb) proved to be effective under open-air conditions in aqueous acetonitrile at room temperature. The protocol
Simple and efficient deprotection of 1,3-dithianes and 1,3-dithiolanes by copper(II) salts under solvent-free conditions
作者:Gabriela Oksdath-Mansilla、Alicia B. Peñéñory
DOI:10.1016/j.tetlet.2007.06.160
日期:2007.8
Aerobic solid state deprotection of 1,3-dithianes and 1,3-dithiolanes of aromatic and aliphatic aldehydes and ketones has been performed in excellent yields by Cu(NO3)2·2.5H2O in the presence of montmorillonite K10 clay and sonic waves at room temperature. These dethioacetalizations proceed more slowly but efficientlyunder catalytic conditions by using 20% of the copper(II) salt with K10 clay and
topoisomerase II and histonedeacetylaseinhibitors. Their inhibitory activities toward histonedeacetylases and Topo II, and their cytotoxicities in cancer cell lines, were evaluated. Among the synthesized hybrid compounds, compound 16b showed the potentHDAC inhibitory activity at a low nanomolar level and exhibited antiproliferative activity toward cancer cell lines including MCF-7 (breast), HCT-116
Catalytic Conjugate Addition of Acyl Anion Equivalents Promoted by Fluorodesilylation
作者:Scott E. Denmark、Lindsey R. Cullen
DOI:10.1021/ol403041k
日期:2014.1.3
The conjugate addition of acylanionequivalents derived from 2-silyl-1,3-dithianes to α,β-unsaturated ketones and esters has been achieved using a substoichiometric amount of TBAF. High yields and short reaction times are observed for the addition of aryl-1,3-dithianes to a variety of cyclic and acyclic α,β-unsaturated carbonyl acceptors. Observation of the reactive anion by 13C NMR spectroscopy and
已经使用亚化学计量的TBAF实现了将2-甲硅烷基-1,3-二硫杂环丁烷衍生的酰基阴离子当量共轭添加到α,β-不饱和酮和酯中。对于将芳基-1,3-二硫杂环丁烷加成到各种环状和无环α,β-不饱和羰基受体上,观察到高产率和短反应时间。还显示了通过13 C NMR光谱观察反应性阴离子并扩展至不对称变体。