反应详情

Hydrazine hydrate (1.26 g, 39.37 mmol) was added dropwise to a solution of 190 (2.13 g, 6.56 mmol) in methanol (50 mL) gently refluxing over Raney nickel (1 g, slurry). The resulting vigorous evolution of hydrogen gas subsided after approximately 10 minutes and the reaction was deemed to be complete by TLC after 2 h. The reaction mixture was filtered through celite and the solvent evaporated. Distilled water (100 mL) was added to the residue, and the aqueous mixture was extracted with EtOAc (3×100 mL) and the combined organic phase washed with H2O (3×100 mL) and brine (3×100 mL) and dried over anhydrous MgSO4. Evaporation of the solvent afforded the product as a brown glass (191) (1.91 g, 6.50 mmol) which was protected directly as the troc-carbamate.

1. filtrationThe reaction mixture was filtered through celite
2. customthe solvent evaporated
3. additionDistilled water (100 mL) was added to the residue
4. extractionthe aqueous mixture was extracted with EtOAc (3×100 mL)
5. washthe combined organic phase washed with H2O (3×100 mL) and brine (3×100 mL)
6. dry with materialdried over anhydrous MgSO4
7. customEvaporation of the solvent