نتایج جستجو برای: urazole
تعداد نتایج: 24 فیلتر نتایج به سال:
Glycosylation of pyrimidine bases to give nucleosides under plausible prebiotic conditions has not been achieved, and this represents a serious challenge to the “RNA world” and to many of its proposed precursors.1 Three decades ago, Orgel and co-workers demonstrated that adenine and hypoxanthine form glycosidic bonds with D-ribose when dried and heated together, although adenine gives mainly th...
Melamine trisulfonic acid (MTSA) as an efficient heterogeneous catalyst has been used for the one-pot preparation of triazolo[1,2-a]indazole-1,3,8-trione and 2H-indazolo[2,1-b]phthalazine-1,6,11-trione derivatives by the three-component condensation reaction of urazoles or phthalhydrazide, dimedone or 1,3-cyclohexanedione, and aldehydes under solvent-free conditions in good to excellent yields ...
Melamine trisulfonic acid (MTSA) as an efficient heterogeneous catalyst has been used for the one-pot preparation of triazolo[1,2-a]indazole-1,3,8-trione and 2H-indazolo[2,1-b]phthalazine-1,6,11-trione derivatives by the three-component condensation reaction of urazoles or phthalhydrazide, dimedone or 1,3-cyclohexanedione, and aldehydes under solvent-free conditions in good to excellent yields ...
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