phosphoric acid; hydrogen; 10 platinum on carbon in water; isopropyl alcohol T=50°C; P=2068.65 Torr; 1 h;

1: With β,β,β-trichloroethoxycarbonylchloride in tetrachloroethane, 1,1,2,2- Addition; 2 h; Heating; 2: With sodium dihydrogenphosphate; zinc in tetrahydrofuran Reduction; 2 h; Heating;

chloroformic acid vinyl ester Deacetylation; demethylation;

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