Ammonium Chloride → (3'r,4's,5s,5's,6'r)-3',4',5'-Tris-benzyloxy-6'-benzyloxymethyl-3-(4-ethylphenyl)-3',4',5',6'-tetrahydro-spiro[thieno[2,3,f]isobenzofuran-5(7h),2'-[2h]pyran]

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(3′R,4′S,5S,5′S,6′R)-3′,4′,5′-tris-benzyloxy-6′-benzyloxymethyl-3-(4-ethylphenyl)-3′,4′,5′,6′-tetrahydro-2-trimethylsilyl-spiro[thieno[2,3,f]isobenzofuran-5(7H),2′-[2H]pyran] (0.094 g, 0.109 mmol) was dissolved in tetrahydrofuran (0.5 mL). A Solution of tetrabutylammonium fluoride/tetrahydrofuran (1.0 M, 0.43 mL) was added thereto, and then the mixture was stirred for 1.5 hours at room temperature. Saturated aqueous ammonium chloride was added thereto, and the resultant mixture was extracted with diethyl ether. The organic layer was concentrated under reduced pressure, to thereby obtain the titled compound (84.5 mg, 98%).

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