作者:Paul A. Bethel、Michael S. Hill、Mary F. Mahon、Kieran C. Molloy
DOI:10.1039/a905336k
日期:——
Reaction of 1,2-bis[2-(tributylstannyl)tetrazol-5-yl]benzene with 1,2-dibromoethane (1∶10) yields the 1-N,1-N′-ethylene bridged cyclophane (1) while similar reactions with larger excesses (1∶25) of 1,n-dibromoalkanes yield 1,2-bis[2-(bromoalkyl)tetrazol-5-yl]benzenes along with the unsymmetrical 1-N,2-N-substituted tetrazole isomers. Analogous products from 1,3-(Bu3SnN4C)2C6H4 are also reported. Similar reactions occur between the two organotin compounds and 1-bromo-n-cyanoalkanes to give 1,m-bis[(cyanoalkyl)tetrazol-5-yl]benzenes (m = 2, 3) as both symmetric and unsymmetrically substituted tetrazole isomers, and which can be further developed to convert the pendant nitriles into tetrazoles by cycloaddition reactions with Bu3SnN3. The Bu3Sn group is easily cleaved by H+ to generate the related N-unsubstituted tetrazoles.
1,2-双[2-(三丁基甲锡烷基)四唑-5-基]苯与1,2-二溴乙烷(1∶10)反应生成1-N,1-N'-亚乙基桥联环芳烷(1),同时类似与较大过量(1∶25)的1,n-二溴烷烃反应生成1,2-双[2-(溴烷基)四唑-5-基]苯以及不对称的1-N,2-N-取代的四唑异构体。还报道了 1,3-(Bu3SnN4C)2C6H4 的类似产物。两种有机锡化合物和 1-溴-n-氰基烷烃之间发生类似的反应,得到 1,m-双[(氰基烷基)四唑-5-基]苯 (m = 2, 3) 作为对称和不对称取代的四唑异构体,并且可以进一步开发,通过与 Bu3SnN3 的环加成反应将侧腈转化为四唑。 Bu3Sn 基团很容易被 H+ 裂解,生成相关的 N-未取代的四唑。