Condensation Oligomers with Sequence Control but without Coupling Reagents and Protecting Groups via Asymmetric Hydroformylation and Hydroacyloxylation

J Org Chem. 2016 Nov 18;81(22):11250-11255. doi: 10.1021/acs.joc.6b02210. Epub 2016 Nov 3.

Abstract

A novel strategy, free of coupling reagents and protection/deprotection steps, for the synthesis of oligo(2-hydroxyacid)s containing up to four monomer units with atom economy, sequence specificity, and control of stereocenter configuration is described. The strategy comprises an iterative application of the sequence asymmetric hydroformylation/oxidation/alkyne hydroacyloxylation that features catalytic, atom-economical C-C and C-O bond forming reactions. Asymmetric hydroformylation with Rh-bisdiazaphospholane catalyst introduces each stereocenter with high enantio- (ca. 93% e.e.), diastereo- (up to 25:1 d.r.), and regioselectivity (>50:1) at low catalyst loadings and mild pressures. The side chain in each monomer is tailored by choosing from a variety of readily available alkynes.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.