Insecticidal properties of some derivatives of L-canavanine
摘要:
The canavanine derivatives D-canavanine and L-homocanavanine as well as the 1-methyl and 1-ethyl esters of L-canavanine were synthesized and evaluated for biological activity in fifth instar larvae of the tobacco hornworm, Manduca sexta [Sphingidae]. While L-homocanavanine did not increase intrinsic toxicity, it was as deleterious as L-canavanine. D-Canavanine was biologically active, as demonstrated by its ability to cause larval edema, but the D-enantiomer had little ability to elicit the larval growth inhibition and pupal deformity which are hallmarks of canavanine toxicosis and was postulated to be linked to aberrant protein production. The 1-methyl and 1-ethyl esters of L-canavanine were synthesized to determine if enhancing canavanine's hydrophobicity might increase its bioavailability. Our experiments revealed that these esters are less toxic than canavanine; the ethyl ester disrupted larval growth more than did the methyl analogue.
Insecticidal properties of some derivatives of L-canavanine
作者:Gerald A. Rosenthal、D. L. Dahlman、Peter A. Crooks、Supinan Na Phuket、L. S. Trifonov
DOI:10.1021/jf00058a034
日期:1995.10
The canavanine derivatives D-canavanine and L-homocanavanine as well as the 1-methyl and 1-ethyl esters of L-canavanine were synthesized and evaluated for biological activity in fifth instar larvae of the tobacco hornworm, Manduca sexta [Sphingidae]. While L-homocanavanine did not increase intrinsic toxicity, it was as deleterious as L-canavanine. D-Canavanine was biologically active, as demonstrated by its ability to cause larval edema, but the D-enantiomer had little ability to elicit the larval growth inhibition and pupal deformity which are hallmarks of canavanine toxicosis and was postulated to be linked to aberrant protein production. The 1-methyl and 1-ethyl esters of L-canavanine were synthesized to determine if enhancing canavanine's hydrophobicity might increase its bioavailability. Our experiments revealed that these esters are less toxic than canavanine; the ethyl ester disrupted larval growth more than did the methyl analogue.