Parallel Synthesis of Aldehydes and Ketone Facilitated by a New Solid-Phase Weinreb Amide.
This paper describes a novel supported Weinreb amide resin that facilitates parallel synthesis of aldehydes and ketones on a scale useful for chemical library synthesis. This new resin makes it possible to produce custom aldehydes and ketones from a wide range of carboxylic acids, including N-BOC-amino acids. A variety of commercially unavailable aldehydes are easily synthesized in parallel and obtained in high purity via a simple filtration workup, thus facilitating parallel synthesis of lead optimization libraries that typically require custom synthesis of aldehyde intermediates for development of structure-activity relationships. To demonstrate the utility of this method, we synthesized a small library based on a supported Horner-Emmons reagent. This is the first time it has been shown that aldehydes generated via a supported Weinreb amide could be used directly as reagents in chemical library synthesis employing moisture-sensitive reactions. The analogous solution reaction is not suited for parallel synthesis because of the laborious extractive workup procedure necessary and, at times, the instability of these reactive intermediates.
Salvino
Joseph M.
JM
Lead Discovery Department, Rhone-Poulenc Rorer, 500 Arcola Road, Collegeville, Pennsylvania 19426.
Mervic
Miljenko
M
Mason
Helen J.
HJ
Kiesow
Terence
T
Teager
David
D
Airey
John
J
Labaudiniere
Richard
R