反应详情

To a mixture of 19.3 g of 4,5,6,7-tetrahydro-4-(2-benzofuryl)-benzofuran-7-ol in 400 ml of toluene was added 100 mg of p-toluene sulfonic acid, and the mixture was placed on a Rotovap®, and the solvent was distilled in vacuo (60° C.) until a residue was obtained. The residue was chromatographed on silica (hexane/methylene chloride 1.5:1) to afford 15.3 g (86%) of 6,7-dihydro-4-(2-benzofuryl)-benzofuran, (Formula III: R2 =H; ##STR9## R4 =2-benzofuryl) as an orange oil.

1. distillationthe solvent was distilled in vacuo (60° C.) until a residue
2. customwas obtained
3. customThe residue was chromatographed on silica (hexane/methylene chloride 1.5:1)