Synthesis of New Tetrazol-5-ylalkenyl Derivatives of Ferrocene by Wittig Olefination

[摘要]：An effective and straightforward method has been developed for the synthesis of new olefinic derivatives of ferrocene that contain tetrazole rings. The method is based on condensation of 1-formyl-, 1,1'- diformyl-, or (E)-1-(2-formylvinyl) ferrocene with 1-substituted [(triphenylphosphoranylidene) methyl]-1H-tetrazoles, which are readily prepared by treatment of the corresponding phosphonium salts with aqueous sodium hydroxide. The olefination reaction proceeds in a diastereoselective manner with formation of the corresponding (E)-alkenes or (E,E)-dienes as the exclusive or major products.

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