Pd(II)-Catalyzed Intramolecular Tandem Olefin Amidation/C–H Activation Protocol for the Syntheses of the Protoberberine Class of Natural Products
作者:Dnyaneshwar N. Garad、Santosh B. Mhaske
DOI:10.1021/acs.orglett.6b01868
日期:2016.8.5
activation protocol has been developed for the synthesis of an 8-oxoprotoberberine core. It was successfully applied for the syntheses of (±)-8-oxocanadine, (±)-8-oxotetrahydropalmitine, and (±)-8-oxostylopine, which can be easily converted to the respective protoberberine natural products. The short synthetic route demonstrated would be useful for the synthesis of a large number of natural products and
New Cyclization Route to the Skeletons of Lennoxamine and Chilenine
作者:Guncheol Kim、Ki Youn Lee、Chul-Hwan Yoo
DOI:10.1080/00397910802116575
日期:2008.9.12
Abstract A newcyclizationroute, triggered by epoxide opening, has been performed to provide the key intermediates for isoindolobenzapine alkaloids, lennoxamine and chilenine. The epoxide was prepared by the Stille reaction using vinyltributylstannane and the following dioxirane treatment. Cyclization under the treatment of BF3 · OEt2 provided an azepine moiety, and the oxidative cyclization toward the
A concise synthesis of chilenine via a sequential reaction process
作者:Guncheol Kim、Philguem Jung、Le Anh Tuan
DOI:10.1016/j.tetlet.2008.02.057
日期:2008.4
readily prepared by the condensation of the corresponding amine and acid. Treatment of the amide with oxalyl chloride in the presence of AlCl3 at room temperature afforded the desired product chilenine through sequential Friedel–Crafts acylation, amide cyclization to imide, and intramolecular Friedel–Crafts type reaction. The synthesis suggests a new potential of oxalyl chloride for a two-carbon synthon