摘要:
                                Syntheses of hitherto unreported 5-aryl-3,3-dimethylchromeno[2,3-b]furo[3,4-dlpyridine-1,11-diones and 6-aryl-4,4-dimethyl-12-oxochromeno[2,3:2',3]pyridino[4',5'-d][1,2]oxazine-2-N-oxide have been accomplished by a metal-free domino-Henry-hetero Diels-Alder reaction. (C) 2013 Elsevier Ltd. All rights reserved.