Chemoselective and Odorless Transthioacetalization of Acetals Using α-Oxo-Ketene Dithioacetals as Thiol Equivalents
作者:Hai-Feng Yu
DOI:10.1080/00397911.2011.631075
日期:2013.5.3
Abstract Using α-oxo-ketene dithioacetals 1a as odorless thiol equivlents, an efficient and odorless transthioacetalization of acetals 2 has been developed. In the presence of MeCOCl in MeOH, the cleavage of 1a commences to generate thiols at both room and reflux temperatures, and the generated thiols then react with acetals 2 to give correspecting thioacetals 3 in good yield. This transthioacetalization
One-Pot Synthesis of 2,4-Diacyl Thiophenes from α-Oxo Ketene Dithioacetals and Propargylic Alcohols
作者:Jian Xue、Li-Gang Bai、Liang Zhang、Yue Zhou、Xiao-Long Lin、Neng-Jie Mou、Dong-Rong Xiao、Qun-Li Luo
DOI:10.1021/acs.joc.0c01093
日期:2020.8.7
Although thiophenes having various functionalities are the basic structural units in numerous bioactive compounds and optoelectronic materials, synthetic routes to acylated thiophenes from aliphatic sulfur-containing starting materials are still rare. In particular, there have been no reports concerning the straightforward synthesis of 2,4-diacylthiophenes from alkynes. Herein, we describe a highly
A one-pot synthesis of substituted pyridines from acyclic ketene-S,S-acetals containing α-acetyl, α-vinyl or α-ethynyl group via the Vilsmeier-Haackreaction has been developed.
A novel and facile synthesis of dienals and substituted 2H-pyrans via the Vilsmeier reaction of α-oxo-ketenedithioacetals
作者:Yingchun Liu、Dewen Dong、Qun Liu、Yimei Qi、Zuo Wang
DOI:10.1039/b313977h
日期:——
A novel and facile synthesis of dienals (3a, 3b) and substituted 2H-pyrans (4c, 4d) from a series of [small alpha]-oxo ketenedithioacetals containing a methyl group adjacent to the carbonyl group (1a-d)via the Vilsmeier reaction has been developed and a mechanism for the reactions has been proposed.
α-Trifluoromethyl-(indol-3-yl)methanols as trifluoromethylated C<sub>3</sub>1,3-dipoles: [3+2] cycloaddition for the synthesis of 1-(trifluoromethyl)-cyclopenta[b]indole alkaloids
作者:Jinhuan Dong、Ling Pan、Xianxiu Xu、Qun Liu
DOI:10.1039/c4cc05895j
日期:——
The first formal [3+2] cycloaddition using α-trifluoromethyl-(indol-3-yl)methanols as the trifluoromethylated C3 1,3-dipoles for the construction of the five-membered carbocycle of 1-trifluoromethylated cyclopenta[b]indole alkaloids is described. An unprecedented step-wise dehydrative alkenylation of α-trifluoromethyl alcohols was revealed as the crucial transformation.