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New tandem epoxidation and oxidation reactions for intermediates in asymmetric organic synthesis

Description:

Highly enantio- and diastereoselective synthesis of epoxy alcohols from an aldehyde

 

Inventor

Patrick J. Walsh, Professor of Chemistry and Alan G. MacDiarmid Term Chair

 

Problem

About half of the top-selling pharmaceuticals are single enantiomers, the precursors of which are chiral substances of high optical purity.  Controlling the stereochemistry of these materials and creating stereogenic centers allows for the preparation of medicinally relevant target molecules as single enantiomers.  There has been a dearth of efficient methods for synthesizing epoxy alcohols, key intermediates in asymmetric organic synthesis.  One prominent reaction is the Sharpless asymmetric epoxidation of prochiral allylic alcohols to yield enantio-enriched epoxy alcohols that readily undergo regioselective ring-opening reactions.  Epoxy alcohols contain up to three functional groups (olefin, carbinol, and epoxide), for high synthetic potential in generating natural products and pharmaceutical compounds.  However, there are chemoselectivity issues in differentiating allylic double bonds when synthesizing allylic epoxy alcohols.

 

Solution

Researchers in the Walsh lab have developed an enantio- and diastereoselective one-pot synthesis method for acyclic and allylic epoxy alcohols under mild conditions with high yields and in high enantiomeric excess.  The method employs an initial asymmetric carbon-carbon bond forming reaction by adding an organozinc or divinylzinc reagent to an aldehyde.  The resulting allylic alkoxide intermediate is epoxidized in situ in the presence of an oxidant, such as air, and a titanium tetraalkoxide catalyst.  Epoxy alcohols with up to three contiguous stereocenters are formed in one pot.

  

 

Advantages

•       Stereoselective and chemoselective

•       One-pot approach for streamlined synthesis

•       Circumvents need to prepare and isolate decomposition-prone intermediates

•       Compatible with wide range of substrates and catalysts

•       Generate up to 3 contiguous stereocenters

 

Applications

•       Versatile intermediates in asymmetric organic synthesis

•       Enantiomeric drug synthesis

•       Natural product synthesis

 

 

Stage of Development

•       Proof-of-principle testing

 

Intellectual Property

USSN 8,236,976

 

Reference Media

Kelly A.R. et al.  JACS, 2005, 127(42), p. 14668-14674.

Kim H.Y. et al.  JACS, 2005, 127(38), p. 13138-13139.

Lurain A.L. et al.  J Org Chem, 2005, 70(4), p. 1262-1268.

Lurain A.L. et al.  JACS, 2004, 126 (42), p. 13608-13609.

 

Desired partnerships

• License

Co-development

 

 

Download PDF

 

Docket #  Q3444 


Patent Information:
For Information, Contact:
Joshua Jeanson
Associate Director, SEAS/SAS Licensing Group
University of Pennsylvania
jeanson@upenn.edu
Inventors:
Patrick Walsh
Keywords: