Craig Method
L. C. Craig, J. Am. Chem. Soc. 56, 231 (1934)
R. C. Elderfield, Heterocyclic Compounds 1, pp 515, 555 (New York, 1950)
H. E. Mertel in The Chemistry of Heterocyclic Compounds; Pyridine and its Derivatives 11, p 334 (New York, 1961).
Also see Claisen Schmidt Condensation