参考文献:
Raymo, Francisco; Kohnke, Franz H.; Cardullo, Francesca; Girreser, Ulrich; Fraser Stoddart Tetrahedron, 1992 , vol. 48, # 33 p. 6827 - 6838
合成效率: ~55%

参考文献:
Urban; Dlabac; Valchar; Protiva Collection of Czechoslovak Chemical Communications, 1984 , vol. 49, # 4 p. 992 - 1001
合成效率: ~77%

参考文献:
Doyle, Michael P.; Lente, Michael A. van; Mowat, Rex; Fobare, William F. Journal of Organic Chemistry, 1980 , vol. 45, # 13 p. 2570 - 2575
合成效率: ~4%

参考文献:
Hart, Harold; Nwokogu, Godson C. Tetrahedron Letters, 1983 , vol. 24, # 51 p. 5721 - 5724