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The present work reports a simple, mild and efficient protocol for the reduction of xanthenediones to 8-hydroxy xanthenones and xanthene1,8-diols by using readily available, cost efficient, easy to handle sodium borohydride as the reducing agent. The products obtained are in good to excellent yields with a short reaction duration. The versatility of the reaction, mild reaction conditions, in combination of high yields and easy work-up makes this reaction noteworthy. The synthesized compounds were analyzed spectroscopically. Further, four derivatives were recrystallized and structures were confirmed by crystallographic studies. The crystal structures are stabilized by intermolecular O–H···O hydrogen bonds and C–H···O weak interactions. [ABSTRACT FROM AUTHOR]

A one-pot synthesis of some novel anionic scaffolds: the substituted-4-((4-trimethylsilyl-1H-1,2,3-triazol-1-yl)methyl)-2H-chromen-2-one is reported. Reaction of 10 different substituted bromomethylcoumarins with trimethylsilylacetylene and sodium azide in the presence of copper(I) iodide catalyst gave the corresponding heteroaryl conjugates: the substituted-4-((4-trimethylsilyl-1H-1,2,3-triazol-1-yl)methyl)-2H-chromen-2-one in 70–92% yields. The structures of the synthesized compounds have been completely characterized by spectral and elemental analyses. For the first time, the representative single-crystal X-ray structure analysis of 6-methoxy-4-((4-trimethylsilyl-1H-1,2,3-triazol-1-yl)methyl)-2H-chromen-2-one is reported which confirms the formation of anionic synthon which bears the trimethylsilyl-group. [ABSTRACT FROM AUTHOR]