Sequential alkylation/transition metal catalysed annulation reactions of 1,3-dicarbonyl compounds with propargyl bromide
作者:Antonio Arcadi、Giorgio Cerichelli、Marco Chiarini、Sabrina Di Giuseppe、Fabio Marinelli
DOI:10.1016/s0040-4039(00)01666-x
日期:2000.11
β-Diketones, β-ketoesters and β-ketonitriles in the presence of propargyl bromide, DBU and a catalytic amount of CuI in toluene give 2,3,5-trisubstituted furans through sequential alkylation/cyclisation/isomerisation reactions.
Decarboxylation with Carbon Monoxide: The Direct Conversion of Carboxylic Acids into Potent Acid Triflate Electrophiles
作者:R. Garrison Kinney、Bruce A. Arndtsen
DOI:10.1002/anie.201814660
日期:2019.4
carboxylic acids into potent acid triflate electrophiles. The reaction involves oxidative carbonylation of carboxylic acids with I2 in the presence of AgOTf, and is postulated to proceed via acyl hypoiodites that react with CO to form acid triflates. Coupling this chemistry with subsequent trapping with arenes offers a mild, room temperature approach to generate ketones directly from broadly available carboxylic
Photocatalytic synthesis of tetra-substituted furans promoted by carbon dioxide
作者:Ya-Ming Tian、Huaiju Wang、Ritu、Burkhard König
DOI:10.1039/d1sc06403g
日期:——
compounds in carbon dioxide (CO2) atmosphere under mild conditions. It was found that CO2 could be incorporated at the diketone enolic OH position, which was key to enabling the cleavage of a C–O bond during the rearrangement of a cyclopropaneintermediate. This method allows for the same-pot construction of two isomers of the high-value tetra-substituted furan scaffold. The synthetic scope and preliminary
Photochemistry of the Nitrogen-Thiocarbonyl Systems. XXII. Photoreaction of Arenecarbothioamides with 5-Membered Heteroaromatics. The Regioselective Photoinduced Aroylation at the 3-Position of 5-Membered Heteroaromatics.
作者:Kazuaki ODA、Minoru MACHIDA
DOI:10.1248/cpb.41.1299
日期:——
Irradiation of arenecarbothioamide iwth 5-membered heteroaromatics, including benzo-fused 5-membered ones, gave regioselectively the corresponding 3-aroyl derivatives.