Sodium Fluoride → (2S,4R)-N-(chloroacetyl)-4-hydroxypyrrolidine-2-carboxylic acid

Anhydrous HF with nitrogen gas was bubbled into a solution of trimethylsilyl (2S,4R)—N-(chloroacetyl)-4-(trimethylsilyloxy)pyrrolidine-2-carboxylate (4.70 g, 15.0 mmol) in 20 ml of acetonitrile in a Teflon container [HF was generated by heating 10 g (100 mmol) of NaF.HF at 215° C. in a Teflon® vessel and carried with nitrogen flow into the solution]. The reaction mixture was then stirred at room temperature for 15 h. The reaction mixture was evaporated to dryness in vacuo. The resulting solid was washed with 100 ml of anhydrous ether and dried in vacuo to yield 2.67 g (yield 92%) of (2S,4R)—N-(chloroacetyl)-4-hydroxypyrrolidine-2-carboxylic acid as a off-white solid: mp 123-124° C. (dec): 1H-NMR (D2O) δ 1.9-2.4 (m, 2H), 3.4-3.7 (m, 2H), 3.9-4.2 (m, 2H), 4.25-4.5 (m, 2H): 13C-NMR (CDCl3) δ 36.65, 41.84, 54.87, 58.36, 69.79, 168.22, 175.30: High Resolution Mass/ESI-APCI method; (M+H)+ 208.0369 (calcd 208.0371 for C7H11ClNO4); (M+Na)+ 230.0189 [calcd 230.0191 for (C7H10ClNO4+Na)].

1. customat 215° C.
2. customThe reaction mixture was evaporated to dryness in vacuo
3. washThe resulting solid was washed with 100 ml of anhydrous ether
4. customdried in vacuo

ORD record

ord-9a60e2332c01409f903464e64784c475

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08203003B2