PROCESS FOR PREPARING A PROPIOLIC ACID OR A DERIVATIVE THEREOF
申请人:Goossen Lukas J
公开号:US20140012000A1
公开(公告)日:2014-01-09
The invention relates to a process for preparing a propiolic acid or a derivative thereof by reacting a terminal alkyne with carbon dioxide, which comprises performing the reaction in the presence of a base and a copper complex, especially a copper (I) complex having at least one ligand, at least one of the ligands of the copper complex being selected from monodentate ligands which have an aminic or iminic nitrogen atom capable of coordination with copper, and polydentate ligands having at least two atoms or atom groups which are capable of simultaneous coordination with copper and are selected from nitrogen, oxygen, sulfur, phosphorus and carbene carbon.
A copper-catalyzed chemo- and stereoselective oxidative bis-trifluoromethylthiolation of propiolic acid derivatives was achieved by using carboxylicacid as the activating group and formic acid as a cosolvent. The reaction of propiolic acid derivatives and AgSCF3 in the presence of (NH4)2S2O8 and catalytic Cu(OAc)2 in MeCN/HCO2H afforded bis-trifluoromethylthiolated acrylic acids in moderate to excellent
通过使用羧酸作为活化基团和甲酸作为助溶剂,实现了丙酸衍生物的铜催化的化学和立体选择性氧化双三氟甲基硫醇化。丙酸衍生物和AgSCF 3在(NH 4)2 S 2 O 8和催化性Cu(OAc)2存在下于MeCN / HCO 2 H中反应,可得到中等收率至优异收率的双三氟甲基硫代丙烯酸,并具有E选择性。所得产物的进一步衍生得到一系列含多取代的SCF 3的烯烃。
Synthesis of Propiolic Acids via Copper-Catalyzed Insertion of Carbon Dioxide into the CH Bond of Terminal Alkynes
作者:Lukas J. Gooßen、Nuria Rodríguez、Filipe Manjolinho、Paul P. Lange
DOI:10.1002/adsc.201000564
日期:2010.11.22
A highly effective copper catalyst has been developed that promotes the insertion of carbondioxide into the CH bond of terminal alkynes under unprecedentedly mild conditions. For the first time, propiolic acids can thus be synthesized in excellent yields from alkynes and carbondioxide in the presence of the mild base cesium carbonate. The catalyst, (4,7-diphenyl-1,10-phenanthroline)bis[tris(4-fl
A carboxylation of terminal alkynes with carbondioxide (CO2) at ambient conditions was developed in situ using a series of N‐heterocyclic carbene (NHC) precursors and Ag2O. The unique structure of NHCs largely increases the solubility of active Ag species and meanwhile activates CO2 by forming the NHC–CO2 adduct. This novel catalytic system demonstrated quite low Ag loading, very high activities,
Intramolecular Didehydro-Diels–Alder Reaction for the Synthesis of Benzo- and Dihydrobenzo-Fused Heterocycles
作者:Ashley E. Bober、Justin T. Proto、Kay M. Brummond
DOI:10.1021/acs.orglett.7b00155
日期:2017.4.7
intramolecular didehydro-Diels–Alder reaction, ene–yne substitutedpyrroles, thiophenes, and furans afford functionalized indoles, benzothiophenes, and benzofurans and the corresponding dihydroaromatic products. Product selectivity for the aromatic or dihydroaromatic product is controlled by the reaction conditions, which vary depending upon the substrate.