Facile entry to an efficient and practical enantioselective synthesis of a polycyclic cholesteryl ester transfer protein inhibitor

Org Lett. 2014 Aug 15;16(16):4142-5. doi: 10.1021/ol501833g. Epub 2014 Aug 1.

Abstract

An efficient enantioselective synthesis of the chiral polycyclic cholesteryl ester transfer protein (CETP) inhibitor 1 has been developed. The synthesis was rendered practical for large scale via the development of a modified Hantzsch-type reaction to prepare the sterically hindered pyridine ring, enantioselective hydrogenation of hindered ketone 6 utilizing novel BIBOP-amino-pyridine derived Ru complex, efficient ICl promoted lactone formation, and a BF3 mediated hydrogenation process for diastereoselective lactol reduction. This efficient route was successfully scaled to produce multikilogram quantities of challenging CETP drug candidate 1.

MeSH terms

  • Cholesterol Ester Transfer Proteins / antagonists & inhibitors*
  • Crystallography, X-Ray
  • Hydrogenation
  • Molecular Conformation
  • Molecular Structure
  • Pyridines / chemical synthesis*
  • Pyridines / chemistry
  • Pyridines / pharmacology*
  • Stereoisomerism

Substances

  • CETP protein, human
  • Cholesterol Ester Transfer Proteins
  • Pyridines