反応 #89651

反応方程式

(3R,4S)-3-acetamido-N-tert-butyl-4-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl)pyrrolidine-3-carboxamide

N-BOC-pyrrolidine-3-one

sodium sulfate

acetic acid

sodium carbonate

sodium triacetoxyborohydride

→

(3R,4S)-3-amino-4-(3-boronopropyl)-1,3′-bipyrrolidine-3-carboxylic acid

収率 112.2%

溶媒

1,2-dichloroethane

反応条件

後処理

1. 1
   温度cooled to room temperature
2. 2
   workup.STIRRINGstirred for 18 h
3. 3
   workup.STIRRINGthe mixture stirred for a few minutes
4. 4
   抽出extracted with ethyl acetate (30 mL
5. 5
   洗浄The combined organic solution was washed with water and saturated aqueous sodium chloride (20 mL each)
6. 6
   乾燥dried (MgSO4)
7. 7
   濃縮concentrated
8. 8
   その他isolated

実験手順

A stirred solution of (3R,4S)-3-acetamido-N-tert-butyl-4-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl)pyrrolidine-3-carboxamide (Example 8, step 4) (198 mg, 0.5 mmol) and N-BOC-pyrrolidine-3-one (0.185 g, 1.0 mmol) in anhydrous 1,2-dichloroethane (5 mL) was treated with anhydrous sodium sulfate (1 g) and glacial acetic acid (30 mg, 0.5 mmol), stirred at 40° C. for 2.5 h, then cooled to room temperature and treated with sodium triacetoxyborohydride (276 mg, 1.3 mmol) and stirred for 18 h. Aqueous sodium carbonate (10%, 5 mL) was added and the mixture stirred for a few minutes and extracted with ethyl acetate (30 mL, then 2×10 mL). The combined organic solution was washed with water and saturated aqueous sodium chloride (20 mL each), dried (MgSO4), and concentrated. The crude material was deprotected and isolated using the method described for example 8, step 5 to afford (3R,4S)-3-amino-4-(3-boronopropyl)-1,3′-bipyrrolidine-3-carboxylic acid (160 mg, 81%) as an amber solid. NMR (D2O) δ 4.25-4.35 (m, 1 H), 4.00 (dd, J1=12 Hz, J2=5 Hz, 1 H) 3.70-3.95 (m, 3 H), 3.25-3.60 (m, 4 H), 2.45-2.65 (m, 2 H), 2.15-2.25 (m, 1 H), 1.50-1.65 (m, 1 H), 1.15-1.35 (m, 3 H), 0.60-0.70 (m, 2 H). MS (m+1): 286.1; MS (m−H2O+1): 268.3.

出典