A recurring motif in many natural products, including those with therapeutic value, is a carbon skeleton with alternating sequences of C-methyl groups without intervening hydroxy groups. A general and iterative route to these deoxypropionate fragments is proposed, using a titanocene-catalyzed asymmetric hydrogenation of a trisubstituted olefin as the key step to setting the methyl stereocenter. The trisubstituted olefin will be constructed with a protected allylic alcohol, so that following hydrogenation, deprotection and oxidation will form an aldehyde, which can then be converted to an analogous but homologated trisubstituted olefin. The iterative route is illustrated by a proposed synthesis of the C2-C10 fragment of the antibiotic (+)- Ionomycin, and by the synthesis of a key intermediate used in the synthesis of the lichen metabolite (+)-Bourgeanic Acid.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
1F32GM018588-01A1
Application #
2522456
Study Section
Medicinal Chemistry Study Section (MCHA)
Project Start
1998-06-18
Project End
Budget Start
1998-04-01
Budget End
1999-03-31
Support Year
1
Fiscal Year
1998
Total Cost
Indirect Cost
Name
Massachusetts Institute of Technology
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
City
Cambridge
State
MA
Country
United States
Zip Code
02139