摘要:
The 1,3-dipolar cycloaddition of (R)-1-(1-phenylethyl)-3-[(E)-arylmethylidene]tetrahydro-4(1H)-pyridinones to nitrile oxides proceeds chemo-, regio-, and stereoselectively affording moderate yields of enantiomerically pure spiro heterocycles comprising piperidine and isoxazoline/dioxazole rings. (c) 2007 Elsevier Ltd. All rights reserved.