Mechanistic aspects of formal [3 + 4] cycloadditions between vinylcarbenoids and furans
作者:Huw M.L. Davies、David M. Clark、David B. Alligood、Glenn R. Eiband
DOI:10.1016/s0040-4020(01)90301-1
日期:1987.1
Rhodium(II) acetate catalyzed decomposition of diethyl 4-diazo-2-pentenedioate resulted in the fomation of a vinylcarbenoid, which underwent formal [3 + 4] cycloaddition reactions with a series of furans. The most likely mechanism for these reactions involves cyclopropanation followed by a Cope rearrangement of the divinylcyclopropane intermediate.
An Intramolecular Cycloaddition Approach to the Kauranoid Family of Diterpene Metabolites
作者:Brenda Callebaut、Jan Hullaert、Kristof Van Hecke、Johan M. Winne
DOI:10.1021/acs.orglett.8b03810
日期:2019.1.4
Synthetic studies toward the ent-kauranoid family of diterpene natural products are reported. An intramolecular (4 + 3) cycloaddition allows the direct elaboration of diverse natural product frameworks, encompassing a challenging bicyclo[3.2.1]octane core. The established routes comprise only a few synthetic operations (3–5 steps), transforming a range of simple starting materials into the tetracyclic
Extraordinary photorearrangement of silylfurans and subsequent thermal rearrangements
作者:Thomas J. Barton、Greg Hussmann
DOI:10.1021/ja00358a025
日期:1983.9
Par transposition photochimique de trimethylsilyl-2 furanne a −78°C, formation du trimethylsilyl-4 butadiene-2,3 al conduisant par hydrogenation catalytique (Pd/c) au trimethylsilyl-3 butanal. Le bis-(trimethylsilyl)-2,5 conduit a la cetone et a l'aldehyde allenylique. La cetone conduit par chauffage en solution diluee benzenique a 150°C au bis (trimethysilyl)-2,4 furanne
Par transposition photochimique de trimethylsilyl-2 furanne a -78°C,形成 du trimethylsilyl-4 butadiene-2,3 al 催化部分氢化催化剂 (Pd/c) au trimethylsilyl-3 butanal。Le bis-(trimethylsilyl)-2,5 导管a la cetone et a l'aldehyde allenylique。La cetone导管 par chauffage en solution diluee benzenique a 150°C au bis (trimethysilyl)-2,4 furanne
10.1021/jacs.4c02674
作者:Ji, Kaijie、Parthiban, Jayachandran、Jockusch, Steffen、Sivaguru, Jayaraman、Porco, John A.
DOI:10.1021/jacs.4c02674
日期:——
framework was serendipitously obtained in a single transformation via triple-dearomative photocycloaddition of chromone esters with furans. This caged structure was generated as part of an effort to access a tricyclic, oxygen-bridged intermediate enroute to the dihydroxanthone natural product nidulalin A. Reaction scope and limitations were thoroughly investigated, revealing the ability to access a multitude
通过色酮酯与呋喃的三重脱芳光环加成,在一次转化中偶然获得了前所未有的笼状2H-苯并二氧代五环十一烷骨架。这种笼状结构的产生是为了在二氢氧杂蒽酮天然产物 nidulalin A 的途中获得三环氧桥中间体。对反应范围和限制进行了彻底研究,揭示了在合成过程中获得多种具有合成挑战性的笼状支架的能力。两步序列。光物理研究为新型笼式支架的形成过程提供了关键的机制见解。
Regiospecific synthesis of aryl(2-furyl)iodonium tosylates, a new class of iodonium salts, from [hydroxy(tosyloxy)iodo]arenes and 2-(trimethylsilyl)furans in organic solvents