Predictably selective (sp3)C-O bond formation through copper catalyzed dehydrogenative coupling: Facile synthesis of dihydro-oxazinone derivatives
An intramolecular dehydrogenative (sp3)C-O bond formation in salicylamides can be initiated by an active Cu/O2 species to generate pharamaceutically relevant dihydro-oxazinones. Experimental findings suggest that stereoelectronic parameters in both coupling partners are controlling factors for site selectivity in bond formation. Mechanistic investigations including isotope labeling, kinetic studies helped to propose a catalytic cycle. The method provides a convenient synthesis of an investigational new medicine CX-614, which has potential in finding treatment for Parkinson's and Alzheimer's diseases.
A catalytic route to ampakines and their derivatives
A catalytic domino reaction that efficiently provides access to an important class of heterocycles, the ampakines, is reported. Our approach is based on the cobalt-catalyzed hydroformylation of dihydrooxazines and allows for the facile synthesis of the pharmaceutically interesting compound CX-614 and related substances.
Mulzer, Michael,Coates, Geoffrey W.
p. 1426 - 1428
(2011/05/04)
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