Total synthesis of (±)-aspercyclide A and its C19 methyl ether
作者:James L. Carr、Daniel A. Offermann、Mary D. Holdom、Philip Dusart、Andrew J. P. White、Andrew J. Beavil、Robin J. Leatherbarrow、Stephen D. Lindell、Brian J. Sutton、Alan C. Spivey
DOI:10.1039/b923528k
日期:——
The total syntheses of (+/-)-aspercyclide A (1) and its C19 methylether (15a) featuring Heck-Mizoroki macrocyclisation to form the 11-membered (E)-styrenyl biaryl ether lactone core are described.
strategies were necessary to bring the individual members of the aspercyclide family into reach. Whereas the strained eleven‐membered ring of aspercyclide C (see figure) could be closed by RCM, it required the power of organochromium chemistry (Nozaki–Hiyama–Kishi reaction) to forge the frame of its sterically even more hindered congener aspercyclide B.
作者:Jimmy J.P. Sejberg、Lucy D. Smith、Robin J. Leatherbarrow、Andrew J. Beavil、Alan C. Spivey
DOI:10.1016/j.tetlet.2013.07.038
日期:2013.9
An efficient synthesis of the natural IgE-Fc epsilon RI PPI inhibitor (+)-aspercyclide A (1) was achieved through the use of a Krische iridium-catalyzed diastereo- and enantioselective alkoxyallylation to form the key mono-protected anti-diol intermediate 4, in high optical purity. A derivative of the natural product (15), containing an oxathiazine dioxide ring in place of the ring-A hydroxyaldehyde unit has also been prepared and found to display comparable ELISA activity to the parent compound, indicating that the aldehyde group is not the key determinant of activity. (C) 2013 Elsevier Ltd. All rights reserved.
Carr, James L.; Sejberg, Jimmy J. P.; Saab, Fabienne, Organic and biomolecular chemistry, 2011, vol. 9, p. 6814 - 6824
作者:Carr, James L.、Sejberg, Jimmy J. P.、Saab, Fabienne、Holdom, Mary D.、Davies, Anna M.、et al.