Gold-Catalyzed Intermolecular anti-Markovnikov Hydroamination of Methylenecyclopropanes with 2-Pyridones
作者:Jacob C. Timmerman、Ross A. Widenhoefer
DOI:10.1002/adsc.201500866
日期:2015.11.16
The cationic gold phosphine complex [(o-biphenylPCy2)Au(NCMe)]+ SbF6− catalyzes the intermolecular, anti-Markovnikovhydroamination of methylenecyclopropanes (MCPs) with 2-pyridones at 80 °C. The transformation was effective for a range of pyridones and for monosubstituted and cis- and trans-disubstituted MCPs to form 1-cyclopropylmethyl-2-pyridones with excellent regio- and diastereoselectivity in
A novel sequence of radical rearrangements involving the 5-exo cyclisation of a 3-(methylenecyclopropyl)propyl radical
作者:Christine Destabel、Jeremy D. Kilburn
DOI:10.1039/c39920000596
日期:——
Radical 10, generated from the corresponding imidazolethiocarbonyl derivative 3 or the phenyl selenide 4, rearranges in a six-step process to give the cyclohexene 5, after reduction; this rearrangement sequence includes the selective 5-Exo cyclisation of a (methylenecyclopropyl)propyl radical and opening of the intermediate cyclopropylmethyl radical to give a ring-expanded product.
Gold-Catalyzed Intermolecular Anti-Markovnikov Hydroamination of Alkylidenecyclopropanes
作者:Jacob C. Timmerman、Bradley D. Robertson、Ross A. Widenhoefer
DOI:10.1002/anie.201410871
日期:2015.2.9
The cationic gold phosphine complex [PCy2(o‐biphenyl)}Au(NCMe)]+SbF6− (Cy=cyclohexyl) catalyzes the intermolecular, anti‐Markovnikov hydroamination reaction of monosubstituted and cis‐ and trans‐disubstituted alkylidenecyclopropanes (ACPs) with imidazolidin‐2‐ones and other nucleophiles. This reaction forms 1‐cyclopropyl alkylamine derivatives in high yield and with high regio‐ and diastereoselectivity
Alkyl radical cyclisations of methylenecyclopropane derivatives
作者:Christine Destabel、Jeremy D Kilburn、John Knight
DOI:10.1016/s0040-4020(01)89429-1
日期:1994.1
Radical cyclisations of various methylenecyclopropane derivatives have been studied. Cyclisation of diphenylsubstituted (methylenecyclopropyl)butyl radical 10 gave the unexpected cyclohexene 5, via a series of radical rearrangements. In further studies, (methylenecyclopropyl) radicals underwent exclusive 5-exo cyclisation, while (methylenecyclopropyl)butyl radicals gave mixtures of products resulting
Radical cyclisations of methylenecyclopropane derivatives
作者:Christine Destabel、Jeremy D Kilburn、John Knight
DOI:10.1016/s0040-4039(00)93404-x
日期:1993.5
Radicalcyclisations of various methylenecyclopropane derivatives have been studied and it has been found that methylenecyclopropyl propyl radicals undergo exclusive 5-exo cyclisation while methylenecyclopropyl butyl radicals give a mixture of products resulting from 6-exo and 7-endo cyclisation. Attempted cyclisations of methylenecyclopropyl pentyl radicals leads to reduced products only.