A convenient synthesis of 2-amino-5,6,7,8-tetrahydro-5-oxo-4-aryl- 7, 7-dimethyl-4H-benzo-[b]-pyran-3-ethylcarboxylates without catalyst
Gao Yuan;Tu Shujiang;Zhou Jianfeng;Shi Daqing
Chin. J. Org. Chem. . 2001, (7): 535 -537 .