作者:Philip S. Jones、Steven V. Ley、Nigel S. Simpkins、Alan J. Whittle
DOI:10.1016/s0040-4020(01)88114-x
日期:1986.1
The first total synthesis of the diterpene clerodane insect antifeedant ajugarin I (1) has been achieved. The key step of the synthesis discloses the use of the 1,3-dithiolane unit to stereochemically direct the conjugate addition of a but-3-enyl cuprate to set in place the C-10 sp3 carbon centre. The trans-fused ring geometry was obtained by conjugate additon of a vinyl cuprate to an enone and regio
Synthesis of perhydrofuro [2,3-b] furan compounds and the structure-activity relationships of the antifeeding active compounds.
作者:Yasuhiro KOJIMA、Natsuki KATO
DOI:10.1271/bbb1961.44.855
日期:——
A new synthetic route to perhydrofuro [2, 3-b] furan was developed by employing 3-sub-stituted furan derivatives (t-butyl and phenyl systems) that were derived by coupling reaction with epoxides and a new reagent, lithium di (3-furyl) cuprate. The synthesized furo-furan compounds were prepared to various derivatives for testing antifeeding activities. The results suggest that higher degree activities depend on the presence of a moderately polar, substituent group. Moreover, in order to enhance the antifeeding activities, the hydroxy group of the hem iacetal should be protected with an acyl or methyl group.