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Alkylidenation of lactones with functionalised titanium carbenoid reagents (Schrock carbenes) followed by acid-induced cyclisation of the resulting enol ethers constitutes a new method for the preparation of [4.4], [4.5] and [5.5] spiroacetals (1,6-dioxaspiro[4.4]nonanes, 1,6-dioxaspiro[4.5]decanes and 1,7-dioxaspiro[5.5]undecanes, respectively, sometimes termed 5,5-, 5,6- and 6,6-spiroketals). The...
A novel route for the solid-phase synthesis of 1,2,5-substituted 7-azabenzimidazole derivatives has been developed. Primary amines are attached to an aldehyde resin then coupled to 6-chloro-5-nitro-nicotinyl chloride. Subsequent alkylation with amines, reduction of the nitro group and cyclisation with aldehydes gives 1,2,5-substituted 7-azabenzimidazole derivatives.
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