title: Synthesis and antimicrobial activity of new (4,4,4-trihalo-3-oxo-but-1-enyl)-carbamic acid ethyl esters, (4,4,4-trihalo-3-hydroxy-butyl)-carbamic acid ethyl esters, and 2-oxo-6-trihalomethyl-[1,3]oxazinane-3-carboxylic acid ethyl esters.
abstract: This work presents a three-step synthesis of a new series of 4-substituted 2-oxo-6-trihalomethyl-[1,3]oxazinane-3-carboxylic acid ethyl esters, from beta-alkoxyvinyl trihalomethyl ketones of general formula X3C-C(O)-CH=C(R)-OR(1), where R = H, Me, Ph, and 4-Me-Ph; R(1) = Me and Et; and X = F and Cl. The Michael addition-substitution of the ethyl carbamate on beta-alkoxyvinyl trihalomethyl ketones furnished the corresponding (4,4,4-trihalo-3-oxo-but-1-enyl)-carbamic acid ethyl esters. These compounds underwent reduction with NaBH4 leading to the respective (4,4,4-trihalo-3-hydroxy-butyl)-carbamic acid ethyl esters. The 3-hydroxy-butyl carbamates were submitted to cyclization reaction with triphosgene to give a series of 4-substituted 2-oxo-6-trihalomethyl-[1,3]oxazinane-3-carboxylic acid ethyl esters. The in vitro antimicrobial activity, of some of the three new series of the title compounds, was assessed against a panel of microorganisms including yeast like fungi, bacteria, and algae, and their minimal inhibitory concentration and minimal fungicidal, bactericidal, and algacidal concentrations were determined. Some of the analyzed carbamates exhibited significant in vitro antimicrobial activity.
authors.affiliation: Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97.015-900, Santa Maria, RS, Brazil. zanatta@base.ufsm.br
authors.forename: Nilo
authors.initials: N
authors.lastname: Zanatta
authors.forename: Deise M
authors.initials: DM
authors.lastname: Borchhardt
authors.forename: Sydney H
authors.initials: SH
authors.lastname: Alves
authors.forename: Helena S
authors.initials: HS
authors.lastname: Coelho
authors.forename: Adriana M C
authors.initials: AM
authors.lastname: Squizani
authors.forename: Tiago M
authors.initials: TM
authors.lastname: Marchi
authors.forename: Helio G
authors.initials: HG
authors.lastname: Bonacorso
authors.forename: Marcos A P
authors.initials: MA
authors.lastname: Martins
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D002264:Carboxylic Acids / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D004951:Esterification; D006900:Hydroxylation; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D015394:Molecular Structure; D010084:Oxidation-Reduction; D013329:Structure-Activity Relationship; D044366:Transition Temperature
chemical_list: D000900:Anti-Bacterial Agents; D002264:Carboxylic Acids