The Synthesis of Azadirachtin: A Potent Insect Antifeedant
作者:Steven V. Ley、Antonio Abad-Somovilla、James C. Anderson、Carles Ayats、Rolf Bänteli、Edith Beckmann、Alistair Boyer、Maria G. Brasca、Abigail Brice、Howard B. Broughton、Brenda J. Burke、Ed Cleator、Donald Craig、Alastair A. Denholm、Ross M. Denton、Thomas Durand-Reville、Luca B. Gobbi、Michael Göbel、Brian Lawrence Gray、Robert B. Grossmann、Claire E. Gutteridge、Norbert Hahn、Sarah L. Harding、David C. Jennens、Lynn Jennens、Peter J. Lovell、Helen J. Lovell、Mary L. de la Puente、Hartmuth C. Kolb、Win-Jan Koot、Sarah L. Maslen、Catherine F. McCusker、Amos Mattes、Andrew R. Pape、Andrea Pinto、Dinos Santafianos、James S. Scott、Stephen C. Smith、Andrew Q. Somers、Christopher D. Spilling、Frank Stelzer、Peter L. Toogood、Richard M. Turner、Gemma E. Veitch、Anthony Wood、Cornelia Zumbrunn
DOI:10.1002/chem.200801103
日期:——
We describe in full the first synthesis of the potent insect antifeedant azadirachtinthrough a highly convergent approach. An O-alkylation reaction is used to unite decalin ketone and propargylic mesylate fragments, after which a Claisen rearrangement constructs the central C8-C14 bond in a stereoselective fashion. The allene which results from this sequence then enables a second critical carbon-carbon
Synthesis of Natural Products from the Indian Neem Tree <i>Azadirachta indica</i>
作者:Gemma E. Veitch、Andrea Pinto、Alistair Boyer、Edith Beckmann、James C. Anderson、Steven V. Ley
DOI:10.1021/ol7027898
日期:2008.2.1
The synthesis of five natural products (3, 6, 7, 10, and 14), isolated from the Indian neem tree Azadirachta indica, is reported from a common intermediate (2). The judicious choice of transacetalization conditions allows efficient access to both the azadirachtinin (9 and 10) and the azadirachtin (3, 6, 7, and 14) skeletons.
A Relay Route for the Synthesis of Azadirachtin
作者:Gemma E. Veitch、Edith Beckmann、Brenda J. Burke、Alistair Boyer、Carles Ayats、Steven V. Ley