A Potent and Orally Efficacious, Hydroxyethylamine-Based Inhibitor of β-Secretase
摘要:
beta-Secretase inhibitors are potentially disease-modifying treatments for Alzheimer's disease. Previous efforts in our laboratory have resulted in hydroxyethylamine-derived inhibitors such as 1 with low nanomolar potency against beta-site amyloid precursor protein cleaving enzyme (BACE). When dosed intravenously, compound 1 was also shown to significantly reduce A beta(40) levels in plasma, brain, and cerebral spinal fluid. Herein, we report further optimizations that led to the discovery of inhibitor 16 as a novel, potent, and orally efficacious BACE inhibitor.
Stereoselective Synthesis ofanti-N-Protected 3-Amino-1,2-epoxides by Nucleophilic Addition toN-tert-Butanesulfinyl Imine of a Glyceraldehyde Synthon†
摘要:
A di-O-TBS protected glyceraldellyde synthon was condensed with Ellman's reagent to form a bench-stable N-tert-butanesulfinyl imine 6, which served as a common intermediate for the stereoselective introduction Of various R groups. The Ellman adducts were converted to useful Multifunctional intermediates 18a-i in one pot. The alcohols 18a-i were efficiently elaborated to both known and novel anti-N-protected-3-amino-1,2-epoxides in two steps. Compound 2a is a key intermediate toward HIV protease inhibitors.