Photolysis of olefinic N-chloropyrrolidinones, N-chlorosuccinimides and N-chloro-oxazolidinones: Reactivity of cyclic carboxamidyl, imidyl and carbamyl radicals in intramolecular reactions
作者:Benoit Daoust、Jean Lessard
DOI:10.1016/s0040-4020(98)01158-2
日期:1999.3
carboxamidyl, imidyl and carbamyl radicals constrained to undergo intramolecular reactions uniquely via their planar or slightly twisted (30–35°) ΠN state (1,5-transfer of an allylic hydrogen, 5-exo or 6-exo cyclization to give bicyclo[2.2.1]azaheptane and bicyclo[3.2.1]azaoctane skeletons respectively), those intramolecular reactions being unaccessible to the planar ΣN state. Their photolysis gave products
Synthesis of Octahydro 1H-Pyrrolo[1,2-a]indol-3-ones Via Intramolecular Diels-Alder Reaction of 5-Substituted N-Dienyl Lactams
作者:Katherine Grant-Young、Michael B. Smith、Timo Ovaska、Chung-Jen Wang
DOI:10.1080/00397919809458704
日期:1998.11
Abstract N-dienyl-5-alkenyl-lactams can be prepared from succinimide. Heating leads to an intramolecular Diels-Alder cyclization that produces tricyclic products useful for the preparation of related alkaloids.
Total synthesis of (±)-anatoxin-a via N-acyliminium intermediates
作者:Karen H Melching、Henk Hiemstra、Wim J Klaver、W.Nico Speckamp
DOI:10.1016/s0040-4039(00)85068-6
日期:1986.1
(±)Anatoxin-a has been synthesized in 8 steps, starting from succinimide, 4-bromo-1-butene and dimethyl (2-oxopropyl)phosphonate, by employing as the key step an intramolecular reaction of an N-acyliminium precursor with an α,β-unsaturated ketone moiety, induced by saturated HCl in MeOH at −50°C.
Preparations on N-(phenylthio)amides from secondary amides are described, and these species are shown to be efficient precursors for amidyl radicals in Bu3SnH mediated reactions; cyclizations of δ,ε-unsaturated amidyl radicals from these precursors and their use in measurement of relative rate constants are reported.
Practical Intermolecular Hydroarylation of Diverse Alkenes via Reductive Heck Coupling
作者:John A. Gurak、Keary M. Engle
DOI:10.1021/acscatal.8b02717
日期:2018.10.5
hydroarylation of alkenes is an attractive approach to construct carbon–carbon (C–C) bonds from abundant and structurally diverse starting materials. Herein we report a palladium-catalyzed reductive Heck hydroarylation of aliphatic and heteroatom-substituted terminal alkenes and select internal alkenes with an array of (hetero)aryl iodides. The reaction is anti-Markovnikov selective with terminal alkenes and tolerates