We devised short syntheses of lankacidinol and lankacyclinol that feature biomimetic Mannich macrocyclization. The modular construction of the carbon framework of these compounds is amenable to rapid structural diversification for the development of antibiotic and antitumor agents.
A highly regio- and diastereoselective TiCl4-mediated vinylogous Mukaiyamaaldolreaction using the chiral vinylketene silyl N,O-acetal has been developed. The present vinylogous Mukaiyamaaldolreaction provides a unique and effective means of controlling remote asymmetric induction. The methyl group at the alpha-position is important in achieving a high level of stereoselectivity. From a synthetic