A novel desymmetrization reaction of an acetogenin precursor: A formal synthesis of trilobacin and asimicin
摘要:
A two-directional strategy which is based on the haloetherification reaction of a bis-5,6-O-isopropylidene alkene, is applied to the synthesis of a versatile relay compound for the bis-THF containing acetogenins. (C) 1998 Elsevier Science Ltd. All rights reserved.
1,2-O-Isopropylidene-5-alkene templates for the synthesis of oligo-tetrahydrofurans
摘要:
The highly functionalized THF 4 was prepared in eight steps from 2,5-cyclooctadiene. The key step in this synthesis was a novel desymmetrization reaction involving the iodoetherification of the C2 symmetric bis-isopropylidene alkene 6 to THF 4. The versatility of 4 was demonstrated by its conversion to bis-THF 3, a known precursor for trilobacin, and to the tris-THF-lactone 5, a potential relay compound for cyclic polyether analogues. (C) 2002 Elsevier Science Ltd. All rights reserved.