Naturally occurring antrocamphin A (1) is a potent anti-inflammatory compound from the edible fungus Antrodia camphorata (Taiwanofungus camphoratus), whose wild fruiting body is used as a valuable folk medicine in Taiwan. This study is the first total synthesis of antrocamphin A (1) and its analogs. Their inhibition ability on NO release, superoxide anion generation, elastase release and platelet aggregation are reported herein.
A copper-catalyzed 1,4-addition reaction of sulfonyl iodides with 1,3-enynes affording various allenyl halides in high yields under mild conditions has been developed. Mechanistic studies showed that the reaction proceeds through a radical mechanism.
Regio- and diastereoselective synthesis of functionalized hydroxyhexahydrocyclopenta[b]furancarboxylates by oxidative radical cyclization of cyclic β-keto esters with alkenes
radical cyclization of cyclic β-keto esters with alkenes is described. Substituted hydroxyhexahydrocyclopenta[b]furancarboxylates having substituents at the 2-position were produced in a diastereoselective manner when the reactions were carried out in the presence of CAN and Cu(OAc)2. As application of the reactions, syntheses of the keto sulfonamide and the cyclichemiacetal containing an exo-olefinic
描述了环状β-酮酯与烯烃的氧化自由基环化。当在CAN和Cu(OAc)2存在下进行反应时,以非对映选择性的方式产生在2-位具有取代基的取代的羟基六氢环戊五[ b ]呋喃羧酸盐。随着反应的应用中,酮基磺酰胺和含有环状半缩醛的合成外-olefinic部分是由使用分别的β烯氨基酯和芳基取代的丙二烯,来完成的。
Solvent-free Dehydration of Alcohols using LiCl-acidic Alumina
During recent years, the microwave irradiation in conjunction with the solid supported catalysts was used to perform a wide range of organic reactions.1,2 The most advantages for these solvent-free microwave-assisted reactions are the high reaction yields, improvement in reaction selectivity, remarkable practical and handling simplicity, decreasing in reaction rate and without the need for the solvents
Nazarov Cyclization/Internal Redox Cyclization Sequence for the Synthesis of N-Heterocyclic Bridged Ring Systems
作者:Yu-Wen Huang、Alison J. Frontier
DOI:10.1021/acs.orglett.6b02369
日期:2016.10.7
conditions, these underwent a through-space 1,5-hydride-transfer/ring-closure reaction to form bridged bicyclic N-heterocyclic compounds with up to four stereogenic centers. It was also possible to convertsimple acyclic dienyl diketones into the bicyclo[3.2.1] products in a one-potprocess (with a solvent switch).