α,β-unsaturated esters is achieved, involving successively the Sharpless epoxidation of allylicalcohols, oxidation to glycidic acids, conversion into α,β-epoxy diazomethyl ketones, and irradiation in ethanol at 300 nm. Intermediates in the photo-induced rearrangement are epoxy ketenes, which undergo ethanolysis with simultaneous opening of the epoxide, preferably via a transition state involving the
Total synthesis of patulolide C and its homo-, nor, and iso analogs
作者:Frank M. C. Leemhuis、Lambertus Thijs、Binne Zwanenburg
DOI:10.1021/jo00077a047
日期:1993.12
The stereospecific total synthesis of the naturally occurring macrolide patulolide C 19Eb as well as its iso, nor, and homo analogs is described by applying the photoinduced rearrangement of enantiomerically pure epoxy diazomethyl ketones 14 to gamma-hydroxy alpha,beta-unsaturated esters 15 as the key step. The required epoxy diazomethyl ketones 14 are obtained by a Sharpless epoxidation of an appropriate allylic alcohol, followed by ruthenium tetraoxide oxidation to an oxiranecarboxylic acid, conversion into a mixed anhydride, and treatment with diazomethane. Macrolide 19Zb, which is a geometrical isomer of 19Eb, turned out to be a diastereomer of natural macrolide isopatulolide C, which implies the 4R,11R configuration for this natural material. X-ray diffraction analyses of 19Ea and 19Eb show that there is a considerable difference in spatial arrangement; particularly, the different torsion angles between the carbonyl and olefinic bonds are note worthy. The conformational behavior of these macrolides is also deduced from the NMR and UV spectra.
THIJS, L.;EGENBERGER, D. M.;ZWANENBURG, B., TETRAHEDRON LETT., 30,(1989) N6, C. 2153-2156
作者:THIJS, L.、EGENBERGER, D. M.、ZWANENBURG, B.
DOI:——
日期:——
THIJS, L.;DOMMERHOLT, F. J.;LEEMHUIS, F. M. C.;ZWANENBURG, B., TETRAHEDRON LETT., 31,(1990) N5, C. 6589-6592
作者:THIJS, L.、DOMMERHOLT, F. J.、LEEMHUIS, F. M. C.、ZWANENBURG, B.