Synthesis of Tetrahydrofurans by a Tandem Hydrogen Atom Abstraction/Radical Nucleophilic Displacement Sequence
摘要:
The reaction of a series of 5-(N-phthalimidoxy)-1-phenyl-1-(diphenylphosphatoxy)pentanes with triphenyltin hydride and AIBN provides alkoxy radicals which undergo 1,5-hydrogen atom abstraction to give beta-(phosphatoxy)alkyl radicals. These radicals then take part in a radical nucleophilic displacement leading, after chain transfer, to tetrahydrofurans.
Inter- and Intramolecular Pathways for the Formation of Tetrahydrofurans from β-(Phosphatoxy)alkyl Radicals. Evidence for a Dissociative Mechanism
作者:David Crich、Xianhai Huang、Martin Newcomb
DOI:10.1021/jo991570o
日期:2000.1.1
mercaptan undergo nucleophilicsubstitution followed by 5-exo-trig radical ring closure leading to tetrahydrofurans in good yield and with high trans selectivity. beta-(Phosphatoxy)alkyl radicals obtained by intramolecular hydrogen 1,5-abstraction with an alkoxyl radical undergo nucleophilic displacement providing tetrahydrofurans. The ensemble of results, including the effects of leavinggroups and substituents
Synthesis of Tetrahydrofurans and Pyrrolidines by Copper-Catalyzed Oxy/Aminoarylation of Alkenes
作者:Yohann Landrain、Gwilherm Evano
DOI:10.1021/acs.orglett.3c01265
日期:2023.6.2
An efficient copper-catalyzed inter/intramolecular oxy/aminoarylation of γ-hydroxy/aminoalkenes with diaryliodonium triflates is reported. Simple activation of these arylating agents with copper(II) triflate in dichloromethane triggers a smooth activation of the alkene, which is simultaneously trapped by the internal nucleophile, yielding, depending upon its nature, a range of highly substituted tetrahydrofurans
报道了 γ-羟基/氨基烯烃与二芳基碘鎓三氟甲磺酸盐的有效铜催化分子间/分子内氧/氨基芳基化。在二氯甲烷中用三氟甲磺酸铜 (II) 简单激活这些芳基化剂会触发烯烃的平稳激活,同时被内部亲核试剂捕获,根据其性质产生一系列高度取代的四氢呋喃和吡咯烷。此外发现环化是立体特异性的,非对映异构烯烃产生环化产物的非对映异构体,并且可以扩展到氧炔基化。