Studies related to the synthesis of pederin. part 2. synthesis of pederol dibenzoate and benzoylpedamide
作者:Timothy M. Willson、Philip Kocienski、Krzysztof Jarowicki、Kim Isaac、Peter M. Hitchcock、Andrew Faller、Simon F. Campbell
DOI:10.1016/s0040-4020(01)81981-5
日期:1990.1
(3) of the insect toxin pederin (1) are described. An intramolecular directed aldol condensation was used to construct the tetrahydropyran ring in (+)-pederol dibenzoate (2). Better stereocontrol in the synthesis of (±)-benzoylpedamide (3) was achieved in which the stereochemistry at C-11 was introduced by a conjugate addition of TMSCN to the dihydropyranone (31). The synthesis of (±)-pederin from (±)-(3)
作者:Philip Kocienski、Piotr Raubo、Justin K. Davis、F. Thomas Boyle、Donna E. Davies、Audrey Richter
DOI:10.1039/p19960001797
日期:——
Metallated dihydropyran 9 and the dihydropyranone 10 previously used in a synthesis of the insect toxin pederin were adapted to the synthesis of 18-O-methyl mycalamide B, the most potent derivative of the anti-tumour agents isolated from a sponge. Key steps in the synthesis include the oxidation of enol silane 11 from the more hindered face using dimethyldioxirane to introduce the hydroxy group at C-12 and the acylation of 6-lithio-3,4-dihydro-2H-pyran 9 with oxalamide 8 to forge the N-(1-alkoxy-1-alkyl)amide bridge. Biological tests in human tumour cell lines confirm the potent anti-proliferative effect of 18-O-methyl mycalamide B in pM concentrations.