1190710-53-2Relevant academic research and scientific papers
Modular total synthesis of archazolid A and B
Menche, Dirk,Hassfeld, Jorma,Li, Jun,Mayer, Kerstin,Rudolph, Sven
supporting information; experimental part, p. 7220 - 7229 (2010/02/17)
(Chemical Equation Presented) A modular total synthesis of the potent V-ATPase inhibitors archazolid A and B is reported. The convergent preparation was accomplished by late-stage diversification of joint intermediates. Key synthetic steps involve asymmetric boron-mediated aldol reactions, two consecutive Still-Gennari olefinations to set the characteristic (Z,Z)-diene system, a Brown crotyboration, and a diastereo-selective aldol condensation of highly elaborate intermediates. For macrocyclization, both an HWE reaction and a Heck coupling were successfully employed to close the 24-membered macrolactone. During the synthetic campaign, a generally useful protocol for an E-selective Heck reaction of nonactivated alkenes and a method for the direct nucleophilic displacement of the Abiko-Masamune auxiliary with sterically hindered nucleophiles were developed. The expedient and flexible strategy will enable further SAR studies of the archazolids and more detailed evaluations of target-inhibitor interactions. 2009 American Chemical Society.
