Synthesis of Novel Spinosyn A Analogues by Pd-Mediated Transformations
作者:Lutz F. Tietze、Gordon Brasche、Alexander Grube、Niels Böhnke、Christian Stadler
DOI:10.1002/chem.200700464
日期:2007.10.15
new or modified established pesticides to avoid the development of serious resistances. Recent reports on the insecticidal spinosyns 1 and 2 show that also this class of pest managing agents is increasingly exposed to the formation of resistances. The synthesis of new derivatives is therefore highly desirable. We describe in this paper a convergent approach towards novel enantiopure spinosyn A analogues
Two different 6-exo-trigonal cyclizations of enantiomerically enriched 6-heptenyl radicals readily afforded versatile synthetic precursors of cis-1,2-dialkyl substituted cyclopentane derivatives. Starting from one of these intermediates, we accomplished an enantiospecific formal synthesis of two important isoprostanes, namely 15-F-2c-IsoP and ent-15-F-2c-IsoP. (C) 2001 Elsevier Science Ltd. All rights reserved.
A facile stereoselective synthesis of (3aR*,4R*,6aS*)-4-(hydroxymethyl)- 3,3a,4,6a-tetrahydrocyclopenta[b]furan- 2-one and other useful cyclopentanoid building blocks.