title: Amides from Piper brachystachyum and Piper retrofractum.
abstract: Three unsaturated amides, designated brachystamides-C, D and E have been characterised from Piper brachystachyum Wall. Brachystamide-C, shown to be N-isobutyl-15-(3',4'-methylenedioxyphenyl)-2E,4E,13E-pentadecatrienamide, was unusual in having a non-conjugated double bond. Piper retrofractum Vahl. yielded retrofractamide-D, which has been fully characterised.
authors.affiliation: Centre of Advanced Studies on Natural Products, Department of Chemistry, University College of Science, 92, Acharya Prafulla Chandra Road, 700 009, Calcutta, India. ab@cucc.ernet.in
authors.forename: Avijit
authors.initials: A
authors.lastname: Banerji
authors.forename: Manjusha
authors.initials: M
authors.lastname: Sarkar
authors.forename: Ratna
authors.initials: R
authors.lastname: Datta
authors.forename: Piyali
authors.initials: P
authors.lastname: Sengupta
authors.forename: Koshy
authors.initials: K
authors.lastname: Abraham
mesh_terms: D000577:Amides / Q000737:chemistry* / Q000302:isolation & purification; D026321:Piperaceae / Q000737:chemistry*
chemical_list: D000577:Amides; C465330:brachystamide-C; C465331:brachystamide-D; C465332:brachystamide-E; C465333:retrofractamide-D