Modified Borohydride Agents; Efficient Reduction of Azides with (1,4-Diazabicyclo[2.2.2]octane) (Tetrahydroborato)zinc Complex [Zn(BH4)2(dabco)] and Methyltriphenylphosphonium Tetrahydroborate [MePh3P+BH4 −

Abstract

(1,4-Diazabicyclo[2.2.2]octane)(tetrahydroborato)zinc complex and methyltriphenylphosphonium tetrahydroborate are stable modified borohydrides which are used for the efficient reduction of aryl, alkyl, and aroyl azides with excellent yields in THF or CH2Cl2 at room temperature or under reflux conditions.