Synthesis
General procedure for the synthesis of (R)-1-Boc-3-carboxypyrrolidine from methyl 1-Boc-pyrrolidine-3-carboxylate: sodium hydroxide (0.80 g, 20.00 mmol) was dissolved in water (15 mL), and this solution was added to a methanol (30 mL) solution of methyl 1-Boc-pyrrolidine-3-carboxylate (2.30 g, 10.00 mmol). . The reaction mixture was allowed to react for 3 hours with stirring at room temperature. After the reaction was completed, the methanol was removed by concentration under reduced pressure. The pH of the remaining aqueous solution was adjusted to 4 with 2 M glacial acetic acid and then extracted with dichloromethane (50 mL x 3). The organic phases were combined and dried with anhydrous sodium sulfate. After filtration, the organic phase was concentrated under reduced pressure to give 1.80 g of an oily product in 83.00% yield.
References
[1] Organic Letters, 2005, vol. 7, # 15, p. 3287 - 3289
[2] Journal of Medicinal Chemistry, 2001, vol. 44, # 1, p. 94 - 104
[3] European Journal of Organic Chemistry, 2005, # 4, p. 673 - 682
[4] Patent: CN106336413, 2017, A. Location in patent: Paragraph 0453; 0454; 0455
[5] Journal of Medicinal Chemistry, 1990, vol. 33, # 7, p. 2052 - 2059
