Synthesis of tetrahydroazocino- and dihydroazepino-1, 2-benzoquinones via amino-claisen rearrangement of 4- (2-vinyl - azetidino and aziridino)-1, 2-benzoquinones
Amino-Claisenrearrangement of 4-(2-vinyl- azetidino or aziridino)-5-methoxy-1,2-benzoquinones 3a,b selectively gives rise to the new tetrahydroazocino — quinone 4a or dihydroazepino — quinone 4b respectively. Based on paramethoxyphenol as starting material, overall yields for the 3 steps synthesis of heterobicyclic quinones 4a,b are 58 and 52%.
Cycloadditions. 37. Molecular mechanics calculations and the stereochemical course of intramolecular dipolar cycloadditions of nitrile oxides
作者:Alfred Hassner、K. S. Keshava Murthy、Albert Padwa、William H. Bullock、Paul D. Stull
DOI:10.1021/jo00256a030
日期:1988.10
Small rings. 29. Synthesis and ring expansion of vinylazetidines. A synthesis of hydroazocines
作者:Alfred Hassner、Norbert Wiegand
DOI:10.1021/jo00369a018
日期:1986.9
Palladium-catalyzed ring-opening reactions of 1-acetyl-4-vinyl-2-azetidinones and 1-sulfonyl-2-vinylazetidines. Role of intramolecular participation of amide anion
Ring opening reactions of 1-acetyl-4-vinyl-2-azetidinones in the presence of palladium(0)-n-Bu(3)P catalyst gave 2,4-pentadienamides in good yields, whereas 2-substituted-1,3-dienes were produced by the reaction of 1-sulfonyl-2-vinyl-2-methylazetidines. Ring opening dimerization took place to give 1,7-ditrifluoromethanesulfonyl-1,7-diazacyclododecane in the reaction of 1-trifluoromethanesulfonyl-2-vinylazetidine.
α-Bromination of aldoximes. A route to fused azetidines.