Reduction of Functionalized
Tertiary Phosphine Oxides
with BH<sub>3</sub>
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Abstract
A direct stereoselective
conversion of tertiary hydroxyalkylphosphine
oxides to the corresponding tertiary hydroxyalkylphosphine–boranes
involving facile reduction of the PO bond by BH<sub>3</sub> under mild conditions has been developed. The unprecedented facility
of reduction of the strong PO bond by BH<sub>3</sub>, a mild
reducing agent, has been achieved through an intramolecular PO···B
complexation directed by proximal α- or β-hydroxy groups
present in the phosphine oxide structures. As established by two chemical
correlations, the developed transformation of hydroxyalkylphosphine
oxides into hydroxyalkylphosphine–boranes takes place with
complete inversion of configuration at P