Total Synthesis of Four Isomers of the Proposed Structures of Cryptorigidifoliol K

Org Lett. 2017 Dec 15;19(24):6506-6509. doi: 10.1021/acs.orglett.7b03174. Epub 2017 Nov 30.

Abstract

The first asymmetric convergent total synthesis of four isomers of proposed structures of cryptorigidifoliol K (1a, 1b, 1c, and 1d) has been achieved from commercially available starting materials. The key steps in this synthesis involve tandem isomerization followed by a C-O and C-C bond-forming reaction for the construction of trans-2,6-disubstituted dihydropyran, iodolactonization, isomerization of terminal alkene, and cross-metathesis reaction. The large discrepancies in the spectroscopic data (1H NMR) of synthetic cryptorigidifoliol K from the natural product suggest that the structure of the natural cryptorigidifoliol K requires revision.

Publication types

  • Research Support, Non-U.S. Gov't