反应详情

The C—H activation/oxidation (Scheme 3) of commercially available bicyclo[1.1.1]pentan-1-amine by an appropriate oxidizing reagent or condition (for example, H2SO4 (conc.)/HNO3 (conc. or 50%); H2SO4 (conc.)/NH4NO3; perfluoro-cis-2-n-butyl-3-n-propyloxaziridine; CBr4/H2O/Mo(CO)6; [(Me3tacn)RuCl3], CAN, AgClO4, t-BuOH/H2O; RuCl3-xH2O, KBrO3, H2O, pyridine, CH3CN; dimethyldioxirane (DMD) or methyl(trifluoromethyl)dioxirane (TFDO), with or without HBF4; CrO3, H5IO6; KMnO4, KOH; and the like) can give 3-aminobicyclo[1.1.1]pentan-1-ol. The amino alcohol intermediate can then be coupled with an appropriate carboxylic acid or acid chloride, such as acetyl chloride to give 3-acetamidobicyclo[1.1.1]pentan-1-yl acetate (3). Selective hydrolysis of the ester group with hydroxide ion gives N-(3-hydroxybicyclo[1.1.1]pentan-1-yl)acetamide (1). Alternatively, starting with N-(bicyclo[1.1.1]pentan-1-yl)acetamide (4), C—H activation/oxidation with an appropriate oxidizing reagent or conditions (for example, see listed above, and H2SO4 (conc.), (CF3CO)2O; NaNO2, TFA, O2; CrO3, CH3CO2H, (H3CO)2O; RuCl3 (cat.), TFA, DCM, peracetic acid; DDQ, TfOH; and the like) can give N-(3-hydroxybicyclo[1.1.1]pentan-1-yl)acetamide (1).