Stereocontrolledsynthesis of two fragments corresponding to the C1-C9 (3) and C16-C23 parts (6) of lysocellin (1) using hydroboration, Wittig-Homer reaction, and Michael reaction in the key steps is described.
A convergent approach to the totalsynthesis of pteridicacid A, having potent plant growth regulator activity, is described. Key steps include the desymmetrization of bicyclic olefin with Brown’s chiral hydroboration, acid-mediated spiroketalization, and zirconium-catalyzed ethylmagnesation protocol to install the ethyl stereocenter at C14.