160559-13-7Relevant academic research and scientific papers
Metal-free annulative hydrosulfonation of propiolate esters: synthesis of 4-sulfonates of coumarins and butenolides
Fernandes, Rodney A.,Gangani, Ashvin J.,Kunkalkar, Rupesh A.
, p. 3970 - 3984 (2020/03/19)
An efficient metal-free and cost-effective method for the synthesis of coumarin and butenolide 4-sulfonates (46 examples) has been developed. The reaction involves addition of sulfonic acids to ethyl propiolates followed by lactonization, resulting in direct formation of coumarin and butenolide 4-sulfonates. This methodology has been elaborated to Sonogashira and Suzuki coupling including the synthesis of rac-tolterodine.
Stereo- and regioselective palladium-catalysed hydroarylation and hydrovinylation of functionalised alkynes: A route to substituted Z-2-cinnamyl esters, 3-chromen-2-ols, and coumarins
Cacchi, Sandro,Fabrizi, Giancarlo,Moro, Leonardo,Pace, Paola
, p. 1367 - 1370 (2007/10/03)
The palladium-catalysed hydroarylation and hydrovinylation of methyl 3-phenylpropynoate and 3,3-diethoxy-1-(o-tetrahydropyranyloxy)phenyl-1-propyne with aryl and vinyl halides or inflates in the presence of Pd(OAc)2 and KOOCH has been studied. The reaction affords stereoselectively syn addition products. The regiochemical outcome appears to be controlled by steric effects and the new carbon-carbon bond is generated preferentially on the carbon far from the aromatic ring ligated to the acetylenic carbon. The reaction can be applied to the synthesis of 3-substituted-3-chromen-2-ols and 3-substituted coumarins.
Condensed heteroaromatic ring systems. XXIV. Palladium-catalyzed cyclization of 2-substituted phenylacetylenes in the presence of carbon monoxide
Kondo, Yoshinori,Shiga, Futoshi,Murata, Naoko,Sakamoto, Takao,Yamanaka, Hiroshi
, p. 11803 - 11812 (2007/10/02)
The palladium-catalyzed reaction of 2-alkynylanilines and 2-alkynylphenols in the presence of carbon monoxide and methanol under basic conditions gave the sequential cyclization/carbonylation products, methyl 2-substituted indole and benzo[b]furan-3-carbo
(Ethoxycarbonyliodomethyl)triphenylphosphonium Iodide: A Convenient Reagent for the Direct Synthesis of β-Substituted Propiolic Acids via the Corresponding Esters
Chenault, Jaques,Dupin, Jean-Francois E.
, p. 498 - 499 (2007/10/02)
Reaction between (ethoxycarbonyliodomethyl)triphenylphosphonium iodide, potassium carbonate, and various aromatic or aliphatic aldehydes in a liquid solid two phases system gives β-substituted propiolic esters.The corresponding acids are obtained in good yield by hydrolysis.
