Stereoselective Cycloaddition of Dibenzoxazepinium Ylides to Acetylenes and Fullerene C<sub>60</sub>. Conformational Behavior of 3-Aryldibenzo[<i>b</i>,<i>f</i>]pyrrolo[1,2-<i>d</i>][1,4]oxazepine Systems
作者:Alexander F. Khlebnikov、Mikhail S. Novikov、Petr P. Petrovskii、Alexander S. Konev、Dmitrii S. Yufit、Stanislav I. Selivanov、Holm Frauendorf
DOI:10.1021/jo100966j
日期:2010.8.6
Cycloaddition of dibenzoxazepinium ylides to acetylene carboxylates leads to cis-3-aryl-3,13b-dihydrodibenzo[b,f]pyrrolo[1,2-d][1,4]oxazepinecarboxylates, which smoothly dehydrogenate to the corresponding pyrrole derivatives. The o-bromophenyl-substituted pyrrole, in contrast to the pyrroline analogue, demonstrates atropoisomerism. Stereoselective cycloaddition of dibenzoxazepinium ylides to fullerene C-60 gives rise to fulleropyrrolidines with cis-configuration. Restricted Ph group rotation is found in the phenyl derivative. Only one of two possible atropoisomers is formed in the reaction of o-bromophenyl-substituted ylide with fullerene C-60. Details of cycloaddition and conformational behavior of cycloadducts were studied by DFT computations.