C–H Functionalization of sp<sup>3</sup> Centers with Aluminum: A Computational and Mechanistic Study of the Baddeley Reaction of Decalin
作者:Catherine L. Lyall、Makoto Sato、Mario Uosis-Martin、Syeda Farina Asghar、Matthew D. Jones、Ian H. Williams、Simon E. Lewis
DOI:10.1021/ja5062246
日期:2014.10.1
undergoes reaction with aluminum trichloride and acetyl chloride to form a tricyclic enol ether in good yield, as first reported by Baddeley. This eye-catching transformation, which may be considered to be an aliphatic Friedel-Craftsreaction, has not previously been studied mechanistically. Here we report experimental and computational studies to elucidate the mechanism of this reaction. We give supporting
Acylation of alkenes generated in situ by hydride transfer from isoalkanes. Synthesis of pentalenones, hydrindenones, and cyclopentenones
作者:Christophe Morel-Fourrier、Jean Pierre Dulcere、Maurice Santelli
DOI:10.1021/ja00021a036
日期:1991.10
Acylation, in the presence of AlCl3 and hydride acceptor, of methylcyclopentane, methylcyclohexane, and 2-methylbutane by ethylenic acyl chlorides, in CH2Cl2 solution, respectively, leads to tetrahydropentalenones, tetrahydroindenones, and cyclopentenones in good yields. Hydride acceptor may be either acetyl chloride or the alkenoyl chloride itself. Better results are performed in the presence of nitromethane and CuSO4. Overall yields are better than those obtained by the two-step process involving acylation of alkenes by alkenoyl chlorides and subsequent Nazarov cyclization of the resulting divinylketones. Methyl 1,4-migration is observed during the acylation of 2-methylbutane by sorboyl chloride. The mechanism of these conversions is discussed on the basis of results observed with cyclohexane-d12 and methylbutane-d6 as well as stereochemical studies of the cyclization process.
A Model System for the Synthesis of Complanadine Alkaloids by “Diverted Kondrat’eva” Oxazole–Olefin Cycloaddition
作者:Mario Uosis-Martin、G. Dan Pantoş、Mary F. Mahon、Simon E. Lewis
DOI:10.1021/jo401014n
日期:2013.6.21
A synthetic approach to complanadine alkaloids is described which employs a Kondrat'eva reaction to construct the pyridine rings. The viability of this approach is demonstrated by its application to a model substrate accessed from unfunctionalized decalin. The key transformation affords the desired tetracyclic architecture with unprecedented incorporation of substituents on the pyridine ring, implicating the oxazole a-hydroxy group as an active participant in the cycloadduct fragmentation process.
909. Further reactions of 10-acetyl-Δ<sup>1(9)</sup>-octalin