反应详情

Ammonium acetate (240 g, 3110 mmol) was added to a solution of (R)-ethyl 2-methyl-5-oxocyclopentanecarboxylate (106 g, 623 mmol) in MeOH (1.2 L). The reaction mixture was stirred at room temperature under nitrogen for 20 hours, after which it was complete as determined by TLC and HPLC. The reaction mixture was concentrated to remove MeOH. The resulting residue was dissolved in DCM, washed twice with H2O, once with brine, dried (Na2SO4), filtered, and concentrated to give (R)-ethyl 2-amino-5-methylcyclopent-1-enecarboxylate (102 g, 97% yield) as an oil. LC/MS (APCI+) m/z 170 [M+H]+.

1. concentrationThe reaction mixture was concentrated
2. customto remove MeOH
3. dissolutionThe resulting residue was dissolved in DCM
4. washwashed twice with H2O, once with brine
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated