NOPR Collection:

Phytochemical investigation of Tephrosia purpurea seeds

2000-11-01T00:00:00Z

Title: Phytochemical investigation of Tephrosia purpurea seeds Authors: Bhatnagar, Ramesh; Kapoor, R C Abstract: Acetyl fraxinol and two new isoflavones 7-O-acetyl-8-methyl-2'-methoxy-isoflavone and 2' ,7-dimethoxy-8-methylisoflavone have been isolated from the seeds of Tephrosia purpurea and characterised on the basis of spectral data analysis and chemical reactions. Page(s): 879-882

Triterpenoids from Mosla chinensis

2000-11-01T00:00:00Z

Title: Triterpenoids from Mosla chinensis Authors: Zheng, Shangzhen; Kang, Shuhe; Shen, Tong; Sun, Liping; Shen, Xuwei Abstract: Two new triterpenes,namely 3,25-epoxy-2β , 3α,7β-trihydroxyolean-12-en-28-oic acid and 3β-angeloyl-2β,23-dihydroxylean-12-en-28-oic acid, along with four known triterpenoids have been isolated from Mosla chinensis. Their structures have been elucidated by means of spectral and chemical evidence. Page(s): 875-878

Two new aliphatic compounds from the leaves of Ziziphus mauritiana

2000-11-01T00:00:00Z

Title: Two new aliphatic compounds from the leaves of Ziziphus mauritiana Authors: Agarwal, Santosh K; Singh, Sudhir S; Verma, Sushma; Kumar, Sushil Abstract: Chemical investigation of the leaves of Ziziphus mauritiana yields two new compounds characterised as decyl-8-hydroxyheptadecanoate 1 and 12-hydroxy-tetratriacontan-9-one 2 using IR, ¹H NMR and mass spectral data. Page(s): 872-874

A facile phase-transfer catalysed N-methylation of 2-substituted benzimidazoles

2000-11-01T00:00:00Z

Title: A facile phase-transfer catalysed N-methylation of 2-substituted benzimidazoles Authors: Dubey, P K; Ramanatham, J; Kumar, Ramesh; Grossert, J S; Hooper, D L Abstract: N-Alkyl-2-acetylbenzimidazoles have been obtained by alkylating 2-acetylbenzimidazole in CH₃CN at RT for 30 min in over 90% yield using triethylbenzylammonium chloride as phasetransfer catalyst and anhyd. K₂CO₃ as base. When the same conditions are used to methylate simple 2-alkylbenzimidazoles, poorer results were obtained. Optimum conditions have been worked out for the methylation of simple 2-alkylbenzimidazoles by changing (a) the solvent, (b) the phase-transfer catalyst, (c) the concentration of the phase-transfer catalyst and (d) the type of phase-transfer catalysis itself. Using the optimised conditions, a number of l-methyl-2-alkylbenzimidazoles have been synthesised in a facile manner. Page(s): 867-871