X. S. Wang, D. Q. Shi, S. J. Tu and C. S. Yao, “A Convenient Synthesis of 5-oxo-5,6,7,8-tetrahydro-4H-benzo-[b]pyran Derivatives Catalyzed by KF-Alumina,” Syn- thetic Communications, Vol. 33, No. 1, 2003, pp. 119-126. Hdoi:10.1081/SCC-120015567

has been cited by the following article:

• TITLE: KF-Al2O3 as an Efficient and Recyclable Basic Catalyst for the Synthesis of 4H-Pyran-3-carboxylates and 5-Acetyl-4H-pyrans

  AUTHORS: Iadeishisha Kharbangar, Md. Rumum Rohman, Hormi Mecadon, Bekington Myrboh

  KEYWORDS: 4H-Pyran derivatives; Ethanol; KF-Al2O3; Room Temperature; Three-Component

  JOURNAL NAME: International Journal of Organic Chemistry, Vol.2 No.3, September 28, 2012

  ABSTRACT: KF-Al2O3 as a recyclable basic catalyst for the three-component synthesis of 4H-pyran derivatives by the reaction of aldehydes, malononitrile and active methylene dicarbonyl compounds in ethanol at room temperature is described. The protocol is environmentally benign and offers rapid access to a wide array of 4H-pyran heterocycles in good to excellent yields.