Direct Synthetic Route to Functionalized 1,2-Azaborinines†
作者： Holger Braunschweig , K. Geetharani , J. Oscar C. Jimenez-Halla , Marius Schäfer
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摘要: A new catalytic synthetic route to functionalized 1,2-azaborinines has been developed by the [2+2]/[2+4] cycloaddition reactions of di-tert-butyliminoboranes and alkynes in presence a rhodium catalyst. The first examples ferrocene-functionalized azaborinines have synthesized using this strategy. Moreover, regioselectivity reaction can be controlled formation an intermediate 1,2-azaborete complex, which results isolation azaborinine boronic ester. NH-containing BN isostere elimination isobutene from N(tBu) group under thermolytic conditions also achieved. Theoretical studies give further insight into group.
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