Reactions of organotin tetrazoles: synthesis of functionalised poly-tetrazoles
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.
Synthesis and characterisation of tetra-tetrazole macrocycles
作者:Andrew D. Bond、Adrienne Fleming、Fintan Kelleher、John McGinley、Vipa Prajapati、Signe Skovsgaard
DOI:10.1016/j.tet.2007.04.065
日期:2007.7
the length of the alkyl-chain linker, the relative orientation of the tetrazole rings on the benzene ring and by intermolecular interactions. In the macrocycles based on 1,2-bis(tetrazole)benzene, the adjacent tetrazole rings on the benzene ring are prevented from becoming co-planar on intramolecular (steric) grounds. In the 1,3- and 1,4-bis(tetrazole)benzenederivatives, there is no such impediment