Syntheses and biological activities of thiotetromycin analogs.

Syntheses and enzyme inhibiting activities of cyclophellitol analogs.

Syntheses and glycosidase inhibiting activities of nagstatin analogs.

Sir: Nagstatin (1) is a novel A^-acetyl-jft-D-glucosaminidase inhibitor isolated from culture nitrates of Streptomyces amakusaensis, and is structurally a nitrogenous 7V-acetylgalactosamine analog fused with an imidazole ring.1} Recently, we have synthesized de-branched nagstatin analogs having different configurations and functionalities, and then determined the absolute structure of nagstatin...

Efficient total syntheses and biological activities of two teixobactin analogues.

The discovery of the new antibiotic teixobactin has been timely in the race for unearthing novel antibiotics wherein the emergence of drug resistant bacteria poses a serious threat worldwide. Herein, we present the total syntheses and biological activities of two teixobactin analogues. This approach is simple, efficient and has several advantages: it uses commercially available building blocks ...

The synthesis and biological activities of some analogs of streptozotocin.

The aand /?-methyl glycosides (IV and V, respectively) of the antibiotic streptozotocin (I) have been synthesized. In addition, analogs involving epimeric changes at C2 (III) and C4 (II), and of two Q analogs, 3-/?-Dglucopyranosyl-1-methyl-l-nitrosourea (XXIII) and the corresponding Dgalactopyranosyl compound (XXV), together with their tetra-O-acetates (XXII and XXIV, respectively) have been pr...

SYNTHESES, ANTIFUNGAL AND ANTIBACTERIAL ACTIVITIES OF SUBSTITUTED 1,2, CTRIMOLES

The reaction of readily available 1 -methyl-4-nitropyrrole-2- carboxylic acid (1) with thionyl chloride afforded the corresponding acyl chloride 2. The reaction of compound 2 with thiosemicarbazides yielded 1-(1 -methyl-4-nitrop yrrole-2-carbony1)- thiosemicarbazides (3) which cyclized in basic medium to 5-(1-methyl-4-nitropyrrole- 2-y1)-2,4-dihydro-3H- l,2,4-triazole-3- thione 4. Alkylatio...