Homogeneous and silica-supported azidoproazaphosphatranes as efficient catalysts for the synthesis of substituted coumarins

Homogeneous and silica-supported azidoproazaphosphatranes derived from the Verkade's superbase catalyze the synthesis of substituted coumarins with moderate to good yields and high selectivity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Examine the catalytic behavior of azidoproazaphosphatranes in the Knoevenagel condensation. ► Preparation of superbase functionalized mesoporous SBA-15 catalysts. ► Azidoproazaphosphatranes immobilized onto SBA-15 silica are efficient for the synthesis of coumarins. ► Molecular and supported azidoproazaphosphatrane catalysts are compared.