Irreversible inhibition of prostaglandin and leukotriene biosynthesis from arachidonic acid by 11,12-dehydro- and 5,6-dehydroarachidonic acids, respectively
Synthesis of the Eight Enantiomerically Pure Diastereomers of the 12-F2-Isoprostanes
摘要:
Syntheses of the eight enantiomerically pure diastereomers of the 12-F-2-isoprostanes (4-11) are described. The key steps included rhodium-mediated intramolecular cyclopropanation and enzymatic resolution of the racemic diol 12.
Degradation of AAL-toxin 1 a host-specific phytotoxin and synthesis of model aminotriol 7a - 7d allowed us to determine the absoluteconfiguration of C(1)C(5) fragment as 2S, 4S and 5R. Unusually rigid conformation of this acyclic fragment was also discussed.
An efficient preparation of stereospecific β-hydroxy nitriles
作者:Sheila H. Jacobo、Mustafa Adiyaman、Chih-Tsung Chang、Nam-In Kang、William S. Powell、Joshua Rokach
DOI:10.1016/j.tetlet.2004.10.174
日期:2005.1
The cyanide-ring opening of thionocarbonates with NaCN in DMF and TBACN in THF is described. This reaction occurred regioselectively to afford β-hydroxy nitrile with preserved stereochemistry of the hydroxy group in high yield.
A convenient strategy for the synthesis of β,γ-unsaturated aldehydes and acids. A construction of skipped dienes
作者:Goutam Saha、Manas K. Basu、Seongjin Kim、Young-Ju Jung、Yurdanur Adiyaman、Mustafa Adiyaman、William S. Powell、Garret A. FitzGerald、Joshua Rokach
DOI:10.1016/s0040-4039(99)01498-7
日期:1999.10
A novel strategy is described for the synthesis of beta,gamma-unsaturated aldehydes which are the useful synthons for the synthesis of arachidonic acid and other eicosanoid products. These beta,gamma-unsaturated aldehydes have been used in the total synthesis of arachidonic acid. (C) 1999 Elsevier Science Ltd. All rights reserved.
Absolute configuration of main chain of AAL-toxins.
AAL-toxins TA(1) 1 and TA(2) 2, host-specific toxins produced by Alternaria alternata, were degraded to 2-methylbutanol, 3-methylnonan-1,9-diol and N-protected 4-aminobutan-1-3-diol, which were further converted to (R)-MTPA esters. These esters were correlated with synthesis samples by comparison of their 500 MHz H-1-NMR spectra. The remaining stereocenters were determined by the comparison of H-1-NMR spectra of 6a and 7 derived from 1 and 2 with those of synthetic model compounds. These data conclude that AAL-toxins possess 2S, 4S, 5R, 11S, 13S, 14R and 15R configurations.
Stereochemical course of 5-lipoxygenation of arachidonate by rat basophil leukemic cell (RBL-1) and potato enzymes