Treatment of the ozonization products from N-acetyl- or 2-methyl-N-trifluoroacetyl-6-(cyclopent-1-enyl)anilines with NaBH4 gives 6-methyl-2-tetrahydropyranylaniline. When treated with Me2S, the ozonization products yield the corresponding oxoaldehyde dimethyl acetals. The oxidation of N-acetyl-2-(cyclopent-1-enyl)- or -(cyclohex-1-ellyl)anilines with H2O2 in HCOOH affords omega-(2-acetamidophenyl)-5-oxopentanoic or -6-oxohexanoic acid, respectively. The reaction of N-acetyl-2-(cyclopent-1-enyl)aniline with H2O2 in the presence of Na2WO4 and H3PO4 gives 3,1-benzooxazine in high yield.
Controlling Olefin Isomerization in the Heck Reaction with Neopentyl Phosphine Ligands
作者:Matthew G. Lauer、Mallory K. Thompson、Kevin H. Shaughnessy
DOI:10.1021/jo501840u
日期:2014.11.21
The use of neopentyl phosphine ligands was examined in the coupling of aryl bromides with alkenes. Di-tert-butylneopentylphosphine (DTBNpP) was found to promote Heck couplings with aryl bromides at ambient temperature. In the Heck coupling of cyclic alkenes, the degree of alkene isomerization was found to be controlled by the choice of ligand with DTBNpP promoting isomerization to a much greater extent than trineopentylphosphine (TNpP). Under optimal conditions, DTBNpP provides high selectivity for 2-aryl-2,3-dihydrofuran in the arylation of 2,3-dihydrofuran, whereas TNpP provided high selectivity for the isomeric 2-aryl-2,5-dihydrofuran. A similar complementary product selectivity is seen in the Heck coupling of cyclopentene. Heck coupling of 2-bromophenols or 2-bromoanilides with 2,3-dihydrofurans affords 2,5-epoxybenzoxepin and 2,5-epoxybenzazepins, respectively.
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作者:A. G. Mustafin、D. I. Dyachenko、R. R. Gataullin、G. Yu. Ishmuratov、R. Ya. Kharisov、I. B. Abdrakhmanov、G. A. Tolstikov
DOI:10.1023/a:1024477115507
日期:——
Ozonolysis of N-acyl-2-(1-methylbut-2-enyl)- and N-acyl-2-(cyclopent-2-enyl)anilines followed by treatment with NaBH4 afforded the corresponding 2-(2-hydroxyethyl-1-methyl) and 2-(1,5-dihydroxypent-2-yl) derivatives. The reaction can be directed to indole derivatives by varying the nature of both the acyl group and reducing reagent.
Ozonolysis of N-acetyl-2-(cyclopent-2-enyl)aniline
作者:Akhat G. Mustafin、Denis I. D’yachenko、Tat’yana V. Khakimova、Leonid V. Spirikhin、Gumer Yu. Ishmuratov、Il’dus B. Abdrakhmanov、Genrikh A. Tolstikov