Geminal‐dichloromethyl derivatives could be efficiently synthesized by the highly chemoselective platinum on carbon‐catalyzed mono‐dechlorination of trichloromethyl substrates in dimethylacetamide (DMA) as a specific solvent at 25 °C under a hydrogen atmosphere.
4,5 Dihalopyrrol 2-yl di and tri halomethyl ketones
申请人:Sterling Drug Inc.
公开号:US03963746A1
公开(公告)日:1976-06-15
4,5-Dihalopyrrol-2-yl di- and trihalomethyl ketones, prepared by reaction of pyrrole with a di- or trihaloacetyl halide or with a di- or trihaloacetic anhydride and halogenation of the resulting pyrrol-2-yl di- or trihalomethyl ketone, useful as antibacterial, herbicidal and insecticidal agents.
Chemoselective Reduction of Trichloromethyl Compounds to <i>gem</i>-Dichloromethyl Groups Following Appel’s Reaction Protocol
作者:Moises A. Romero-Reyes、Ivann Zaragoza-Galicia、Horacio F. Olivo、Moises Romero-Ortega
DOI:10.1021/acs.joc.6b02044
日期:2016.10.7
trichloroacetyl compounds following the modification of Appel’s reaction protocol, using triphenylphosphine and methanol, afforded the corresponding dichloroacetyl compounds, with the exception of trichloroacetylmorpholine, in yields of 80–98% under very mild experimental conditions. Likewise, when trichloromethyl heterocyclic compoundscontain another reactive functional group, the reaction is highly chemoselective
Spectroscopic and theoretical studies on some new pyrrol-2-yl-chloromethyl ketones
作者:Alina T. Dubis、Małgorzata Domagała、Sławomir J. Grabowski
DOI:10.1039/b9nj00507b
日期:——
A novel series of pyrrole-2-yl chloromethyl ketones were synthesized and studied by FT-IR, 1H, 13C NMR spectroscopy and DFT calculations at the B3LYP/6-311++G(d,p) level of approximation. Two stable conformations were detected in solution: s-cis and s-trans forms where the CO group is located on the same side or the opposite side of N–H group, respectively. The conformational stability of these molecules is governed mainly by intermolecular hydrogen bonding interactions. The strength of hydrogen bonds was evaluated on the basis of 1H chemical shift and infrared red shift ΔνN–H of the stretching vibration of N–H proton donating bonds. The quantum theory of ‘atoms in molecules’ as well as the natural bond orbital method were applied to characterize hydrogen bonding interactions.
New routes for the synthesis of fused pyrrole scaffolds through transition metal-free tandem reactions
作者:Bingchuan Yang、Zixiao Huang、Hegen Guan、Xiaoyi Niu、Yanqiu Li、Shuai Fang、Chen Ma
DOI:10.1016/j.tetlet.2013.08.060
日期:2013.11
A series of transition metal-free tandem reactions for the synthesis of indolizines and 6,7-dihydroindolizin-8(5H)-ones by 4-bromobut-2-enoate ramifications reacted with 2-acetyl pyrrole derivatives are described. As the α-carbon changed from CH3, CH2Cl, CHCl2, to CCl3, different kinds of tandem reactions were observed. These tandem reactions could be used to synthesize fused indolizine and indolizidine