Total Synthesis of 19-Nordigitoxigenin, An Antiaroside Y Aglycon

J Org Chem. 2023 Nov 3;88(21):15142-15150. doi: 10.1021/acs.joc.3c01629. Epub 2023 Oct 12.

Abstract

The first total synthesis of 19-nordigitoxigenin, an aglycon of antiroside Y, has been achieved. The key steps of our synthesis are (i) construction of the 19-norsteroid ring system via a Mizoroki-Heck reaction between a bromoanisole corresponding to the A-ring and cyclic alkene incorporating the CD-rings, followed by a Friedel-Crafts-type cyclodehydration, and (ii) incorporation of the butenolide moiety at C17 via a silyl-tethered radical cyclization and subsequent ozone oxidation.