Tacrolimus → 17-Allyl-12-[2-[3-methoxy-4-(3-(2-trimethylsilylethoxycarbonyl)propylcarbamoyloxy)cyclohexyl]-1-methylvinyl]-1,14-dihydroxy-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9]octacos-18-ene-2,3,10,16-tetraone

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A solution of the FR-900506 substance (310 mg), 2-trimethylsilylethyl 4-isocyanatobutyrate (350 mg) and triethylamine (6 drops) in anhydrous benzene (4 ml) was heated at 50° C. with stirring for 2 hours. The reaction mixture was allowed to stand at room temperature overnight. The mixture was concentrated to dryness under reduced procedure to leave a residue, which was chromatographed on silica gel in chloroform. Elution was carried out with chloroform to give 17-allyl-12-[2-[3-methoxy-4-{3-(2-trimethylsilylethoxycarbonyl)propylcarbamoyloxy}cyclohexyl]-1-methylvinyl]-1,14-dihydroxy-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone (99 mg). This product was treated with tetra(n-butyl)ammonium fluoride (0.12 m mole) in tetrahydrofuran (2.5 ml) at room temperature for 20 minutes. The reaction mixture was concentrated to dryness under reduced pressure to leave a residue, which was purified with preparative thin layer chromatography on silica gel. Elution with a mixture of chloroform and methanol (5:1) gave 17-allyl-12-[2-{4-(3-carboxypropylcarbamoyloxy)-3-methoxycyclohexyl}-1-methylvinyl]-1,14-dihydroxy-23,25-dimethoxy-]13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo-[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone (18.1 mg).

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