Preparation of chiral isoxazole carbinols via catalytic asymmetric Corey-Bakshi-Shibata reduction.
作者:Nicholas R. Natale、Kevin C. Rider、David J. Burkhart、Chun Li、Andrew R. McKenzie、Jared K. Nelson
DOI:10.3998/ark.5550190.0011.809
日期:——
A diverse set of isoxazoles, with activity in three different disease categories, was reduced asymmetrically from pro-chiral ketones to chiral alcohols using the Corey-Bakshi-Shibata methodology at the α, β, and γ positions relative to the C-5-methyl of the isoxazole. The experiments described provide an easy route to hydroxylated isoxazoles that represent the common CYP-450 3A4 metabolic site.
Preparation and crystal structures of two 3‐anthracenyl isoxazolyl sulfonamides
作者:Chun Li、Brendan Twamley、Nicholas R. Natale
DOI:10.1002/jhet.5570450132
日期:2008.1
Lateral metalation and oxidation of 3-(9′-anthryl)-isoxazoles (1), using Davis' oxaziridine (6), produced the desired hydroxylation (2), along with sulfonamide adduct (3), and in the case of the use of butyl lithium as base, butyl addition products (4) and (5). Structures of isoxazole sulfonamides (3a) and (5a), were obtained as the SR/RS-diastereomer, however, studies indicate that this is a consequence