Nickel-Catalyzed Decarbonyloxidation of 3-Aryl Benzofuran-2(<i>3H</i>)-ones to 2-Hydroxybenzophenones
作者:Zhou Tong、Zhi Tang、Chak-Tong Au、Renhua Qiu
DOI:10.1021/acs.joc.0c00858
日期:2020.7.2
nickel-catalyzed decarbonyloxidation of 3-aryl benzofuran-2(3H)-ones to 2-hydroxybenzophenones under mild conditions, which is an efficient approach for the decarbonyloxidation of lactones in organic synthesis. A diverse range of substrates can undergo C(O)–O/C(O)–C bondcleavage to generate the target products in good yields. These 2-hydroxybenzophenones can be converted into a variety of compounds via reactions
Palladium Catalyzed Direct Acylation of Iodo-Acetanilides/Iodo-Phenyl Acetates: Domino One-Pot Synthesis of 2-Quinolinones
作者:Scuhand Basuli、Gedu Satyanarayana
DOI:10.1002/ejoc.201701250
日期:2018.2.28
acetates with aldehydes, was presented. Simple bench-top aldehydes were used as the non-toxic acylating agents. This protocol comprises direct coupling with aldehydes without activating the carbonyl group and without the directing group assistance. The strategy was applied to a domino one-potsynthesis of 2-quinolinones via acylation and intramolecularaldolcondensation. Significantly, the strategy was extended
A Facile Synthesis of Highly Functionalized 4-Arylcoumarins via Kostanecki Reactions Mediated by DBU
作者:In-Taek Hwang、Sun-Ah Lee、Jin-Soo Hwang、Kee-In Lee
DOI:10.3390/molecules16086313
日期:——
An efficient synthesis of 4-arylcoumarins has been accomplished via Kostanecki reactions of 2-hydroxybenzophenones with acetic anhydride employing DBU at ambient temperature. Using the same strategy, several 2-acyloxybenzophenone derivatives were readily converted to 3,4-difunctionalized coumarins. This protocol offers a notable improvement in reaction conditions for coumarin synthesis and takes advantage of its synthetic capability, especially for highly functionalized 4-arylcoumarins with structural diversity.
Aromatic acyloxycarbonyl- and acylamidocarbonyl compounds on treatment with titanium on graphite (4 equivalents) readily afford (benzo)furans and indoles respectively, by an unprecedented McMurry-type reaction.