HOTf mediated cascade reactions of 1-arenoylcyclopropanecarboxylic acids with arenes
作者:Gen-Qiang Chen、Xiang-Ying Tang、Min Shi
DOI:10.1039/c2cc17581a
日期:——
The cascade reactions of 1-arenoylcyclopropanecarboxylic acids with arenes proceed smoothly in freshly distilled HOTf to give the corresponding tetrahydro-5H-benzo[c]fluorene derivatives in good yields along with high stereoselectivities under mild conditions.
An organocatalytic Cloke–Wilson rearrangement of cyclopropyl ketones to 2,3-dihydrofurans is exploited utilizing the homoconjugate addition process. With 1,4-diazabicyclo[2.2.2]octane as the catalyst, the rearrangement in DMSO at 120 °C proceeded in generally high yields, exclusive regioselectivity, and a broad substrate scope. An examination of the mechanism including stereochemical analysis and intermediate
“On water” palladium catalyzed diastereoselective boronic acid addition to structurally diverse cyclopropane nitriles
作者:Dwaipayan Das、Prasun Mukherjee、Asish R. Das
DOI:10.1039/d0ob00077a
日期:——
An efficient palladium catalyzeddiastereoselective addition of arylboronic acids to complex spirocyclopropyl dinitriles is developed in the presence of a catalytic amount of 4-dodecylbenzenesulphonic acid (DBSA) as a Brønstedacid surfactant in aqueousmedia. The protocol is also found to be highly effective when different types of nitrile compounds and organo-boron compounds are used. The overall
Base-Mediated Divergent Synthesis of Spiro-heterocycles Using Pronucleophiles and Ethylene via Thianthrenation
作者:Hongru Wu、Jie Wang、Haochuan Jing、Zhaofei Zhang、Wei Ou、Chenliang Su
DOI:10.1021/acs.orglett.4c01435
日期:2024.7.5
Spirocyclic compounds are abundant in biologically active products. However, the divergent synthesis of spirocyclic compounds using low-cost and abundant available starting materials remains a challenge. Herein, we report an effective method for producing spirocyclic motifs using a cyclic β-carbonyl ester or amide and ethylene via thianthrenation. This strategy highlights the exciting possibility of
An efficient Ru-catalyzed synthesis of dihydrofuroquinolines from azido-cyclopropyl ketones via the reduction-cyclization-rearrangement process is reported. A plausible reaction mechanism for this process is depicted. Additionally, when the reaction was carried out under H-2 (1 atm) In the presence of Pd/C, 4-quinolones were obtained in excellent yields.