Akitoshi Tajimi

Four fungitoxic C-18 hydroxy unsaturated fatty acids from stromata of epichloe typhina

Abstract Four fungitoxic C-18 hydroxy unsaturated fatty acids ( 1 )–( 4 ) have been isolated from stromata of Epichloe typhina . Their structures including the absolute configuration have been elucidated from spectral data.

Three phenolic acid derivatives from stromata of Epichloe typhina on Phleum pratense

Abstract Three new phenolic acid derivatives, 1,3- O -di- trans - p -coumaroylglycerol, 1,2- O -di- trans - p -coumaroylglycerol and chokorin were isolated from stromata of Epichloe typhina on timothy plants Phleum pratense . Their structures were established by spectroscopic and chemical means.

A ring B aromatic sterol from stromata of Epichloe typhina

Abstract A sterol with an aromatized B ring was isolated from stromata of Epichloe typhina growing on Phleum pratense . The structure was established as 1(10→6) abeo -ergosta-5,7,9,22-tetraen-3α-ol by spectral analysis and synthesis.

Gamahonolides A, B, and Gamahorin, Novel Antifungal Compounds from Stromata of Epichloe typhina on Phleum pratense

Four novel antifungal compounds, gamahonolides A and B, gamahorin, and 5-hydroxyl-4-phenyl-2(5H)-furanone, were isolated from stromata of Epichloe typhina on Phleum pratense. Their structures were determined by spectroscopic methods. The absolute configuration of gamahonolide A was determined by its ORD spectrum and (1)H-NMR shift difference between the diastereomeric pair of its O-methylmandelates. The stereochemistry of gamahorin was determined by NOE difference spectra and its CD spectrum.

Three fungitoxic cyclopentanoid sesquiterpenes from stromata of epichloe typhina

New fungitoxic sesquiterpenes, chokol A (1), B (2), and C (3), have been isolated from stromata of Epichloe typhina. Their structures and the relative configuration of 3 have been also elucidated from spectral data.

Two sphingoid derivatives from stromata of Epichloe typhin A on Phleum pratense

Abstract Two novel sphingoid derivatives were isolated from stromata of Epichloe typhina on timothy grass, Phleum pratense . Their structures were determined as 3-hydroxy-9-oxo-4-tetradecyl-5-oxa-1-azabicyclo[4.3.0]nonane-2-methanol and 3-hydroxy-9-oxo-4-(4 E -tetradecenyl)-5-oxa-1-azabicyclo[4.3.0]nonane-2-methanol by spectroscopic methods.