An nBu4NI-catalyzed oxidative cross-dehydrogenative-coupling of β-dicarbonyl compounds with acetone undermild reaction conditions is described. This methodology provides a straightforward pathway to synthesize 2-carbonyl-1,4-diketones and features a simple system, low reaction temperature, and environmental friendliness.
Iodine-Catalyzed Synthesis of Substituted Furans and Pyrans: Reaction Scope and Mechanistic Insights
作者:Domenic P. Pace、Raphaël Robidas、Uyen P. N. Tran、Claude Y. Legault、Thanh Vinh Nguyen
DOI:10.1021/acs.joc.1c00608
日期:2021.6.18
Substituted pyrans and furans are core structures found in a wide variety of natural products and biologically active compounds. Herein, we report a practical and mild catalytic method for the synthesis of substituted pyrans and furansusing molecular iodine, a simple and inexpensive catalyst. The method described is performed under solvent-free conditions at an ambient temperature and atmosphere,
organic reactions involving carbonylgroups, 1 such as the Barbier reaction, 2 aldol reaction, 3 andHosomi–Sakurai reaction. 4 Indium can also activate C–Ctriple bonds to form new C–C bonds, because of its soft-ness, as reported by us 5 and others. 6 Formation of carbon–heteroatom bonds via activation of triple bonds has alsobeen reported. For instance, Tan et al. 7a described that 10mol% of InCl 3 promotes
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.
Iron(III) chloride-catalyzed synthesis of 3-carboxy-2,5-disubstituted furans from γ-alkynyl aryl- and alkylketones
作者:Alexander N. Golonka、Corinna S. Schindler
DOI:10.1016/j.tet.2017.04.030
日期:2017.7
synthesis of 3-carboxy-2,5-disubstituted furans is reported proceeding via a 5-exo-dig cycloisomerization reaction. The iron(III) chloride-catalyzed transformation of aryl- and alkyl β-ketoesters enables synthetic access to functionalized furan core structures found in many natural products and complex molecules of biological importance. The method described herein, represents a mild and efficient alternative