Tetrahedron letters

Naphtho [1, 2-c; 5, 6-c] difuran, a stable isobenzofuran derivative

WY Daniel, KE Preuss, TD Dejikhangsar, PW Dibble

Index: Yu, Daniel W.; Preuss, Kathryn E.; Cassis, Paulette R.; Dejikhangsar, T. Dontem; Dibble, Peter W. Tetrahedron Letters, 1996 , vol. 37, # 49 p. 8845 - 8848

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Citation Number: 11

Abstract

In 40 mL of 1:1 methylene chloride/diethyl ether was dissolved 100 mg 8 (0.37 mmol) and 112 mg dimethyl fumarate (0.78 mmol). A few crystals of p-toluenesulphonic acid (TsOH) were added and the mixture refluxed for 4 h. The solvent was removed under reduced pressure and the residue dissolved in 5 mL of methanesulphonic acid. After stirring for 1 hour, water was added and the mixture extracted with chloroform. The organic phase was separated, dried over MgSO 4 , ...