Stereospecific synthesis of (R)- and (S)-S-adenosyl-1,8-diamino-3-thiooctane, a potent inhibitor of polyamine biosynthesis. Comparison of asymmetric induction vs enantiomeric synthesis
作者:Chin Liu、James K. Coward
DOI:10.1021/jm00111a026
日期:1991.7
induction and the other involving an enantiomeric synthesis. The latter route gave the desired products in greater than 96% de, whereas the synthesis based on asymmetric induction resulted in only 80% de in the final product. Evaluation of the two diastereomers as inhibitors of spermidine synthase showed that the R diastereomer is a more potent inhibitor than the S diastereomer.
Synthetic study of spiroiridal triterpenoids: construction of functionalized spiro[4.5]decane skeleton using Claisen rearrangement of 2-(alkenyl)dihydropyran
The spiroiridal triterpenoids show interesting biological activities, such as a piscicidal activity, PKC activation, and molluscicidal activity. Herein, the first synthesis of the functionalized spiro[4.5]decane skeleton of spiroiridal triterpenoids was accomplished. The characteristic features of the present synthesis are the Claisen rearrangement of 2-(alkenyl)dihydropyran developed by our group and the efficient transformation into the key intermediate (+)-6. (C) 2014 Elsevier Ltd. All rights reserved.
LIU, CHIN;COWARD, JAMES K., J. MED. CHEM., 34,(1991) N, C. 2094-2101