Hydrogen Peroxide → rel-tert-Butyl (3aR,6aS)-5-(hydroxymethyl)hexahydrocyclopenta[c]pyrrole-2(1H)-carboxylate

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Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, borane tetrahydrofuran complex (1M in THF, 42 mL, 41.9 mmol) was diluted with tetrahydrofuran (42 mL) and cooled with an ice bath. Neat 2,3-dimethylbut-2-ene (5.0 mL, 41.9 mmol) was added in portions over 0.25 h and the solution was stirred at 0° C. for 3 h. A solution of 1,1-dimethylethyl (3aR,6aS)-5-methylidenehexahydrocyclopenta[c]pyrrole-2(1H)-carboxylate (1.98 g, 8.88 mmol) in tetrahydrofuran (10 mL) was added slowly, and the solution was warmed to room temperature and stirred 12 h. After cooling to 0° C., 10% aqueous sodium hydroxide (17 mL, 41.7 mmol) was added slowly, followed by 30% aqueous hydrogen peroxide (13 mL, 128 mmol) and the solution was warmed to room temperature. The solvent was removed in vacuo and the solution was partitioned between water and diethyl ether. The layers were separated and the aqueous layer was further extracted (3×50 mL diethyl ether). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to provide 2.04 (95%) of 1,1-dimethylethyl (3aR,6aS)-5-(hydroxymethyl)hexahydrocyclopenta[c]pyrrole-2(1H)-carboxylate, which was used without purification. 1H NMR (400 MHz, CDCl3): 8.50 (broad s, 1H), 3.66-3.46 (m, 3H), 3.20-3.00 (m, 2H), 2.70-2.59 (m, 2H), 2.37-2.18 (m, 1H), 2.04 (m, 1H), 1.84 (broad s, 1H), 1.70-1.55 (m, 1H), 1.46 (s, 9H), 1.17 (m, 1H), 0.93 (m, 1H).

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