This revised grant application details our plans to utilize, based upon preliminary findings, a cascade reaction in which a vinyl organometallic addition to a ketone initiates an apparent anionic oxy-Cope rearrangement followed by a transannular cyclization. This three step tandem reaction is capable of converting simple cyclic 2-vinyl-beta-ketoesters to complex polycyclic structures in a single transformation. Bridgehead olefin-containing molecules, medium-size rings, and complex fused ring systems are all accessible using this reaction. On the basis of these results, our specific aims involve: (1) Elucidation of the mechanism of this process using stereochemical probes. (2) Studies to explore the generality of the cascade sequence with applications to the synthesis of bridgehead olefin- containing molecules, medium-size rings, and fused ring systems. The conversion of the medium-size ring systems to fused bicyclic structures via transannular cyclizations will also be explored. (3) Application of the cascade reaction to the total synthesis of the ras farnesyltransferase inhibitors CP-225,917 and CP-263,114. These molecules are currently undergoing testing as inhibitors of tumor progression and a concise synthetic route will provide access to variants for biological evaluation.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM059403-02
Application #
6343077
Study Section
Medicinal Chemistry Study Section (MCHA)
Program Officer
Schwab, John M
Project Start
2000-01-01
Project End
2004-12-31
Budget Start
2001-01-01
Budget End
2001-12-31
Support Year
2
Fiscal Year
2001
Total Cost
$190,992
Indirect Cost
Name
Harvard University
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
071723621
City
Cambridge
State
MA
Country
United States
Zip Code
02138