频那醇硼烷 → (3R,4S)-tert-butyl 3-acetamido-3-(tert-butylcarbamoyl)-4-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl)pyrrolidine-1-carboxylate

HRID 61355

反应方程式

HRID 61355 反应方程式
[C:1]([NH:4][C@:5]1([C:20](=[O:26])[NH:21][C:22]([CH3:25])([CH3:24])[CH3:23])[C@@H:9]([CH2:10][CH:11]=[CH2:12])[CH2:8][N:7]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:6]1)(=[O:3])[CH3:2].[CH3:27][C:28]1([CH3:35])[C:32]([CH3:34])([CH3:33])[O:31][BH:30][O:29]1>C(Cl)Cl.[Ir].ClC1CCC=CCCC=1.C1(P(C2C=CC=CC=2)CCP(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[C:1]([NH:4][C@:5]1([C:20](=[O:26])[NH:21][C:22]([CH3:25])([CH3:24])[CH3:23])[C@@H:9]([CH2:10][CH2:11][CH2:12][B:30]2[O:31][C:32]([CH3:34])([CH3:33])[C:28]([CH3:35])([CH3:27])[O:29]2)[CH2:8][N:7]([C:13]([O:15][C:16]([CH3:17])([CH3:18])[CH3:19])=[O:14])[CH2:6]1)(=[O:3])[CH3:2]

参与物

6

反应物 2

HCID 2734768频那醇硼烷HCID 69669632rel-(3R,4S)-tert-Butyl 3-acetamido-4-allyl-3-(tert-butylcarbamoyl)pyrrolidine-1-carboxylate

产物 1

HCID 67517991(3R,4S)-tert-butyl 3-acetamido-3-(tert-butylcarbamoyl)-4-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl)pyrrolidine-1-carboxylate收率 82.5%

试剂、催化剂与溶剂 3

HCID 742671,2-双(二苯基膦)乙烷催化剂HCID 86594784Chloro-1,5-cyclooctadiene iridium催化剂HCID 6344二氯甲烷溶剂

反应条件

温度
-20 °C

实验过程

A stirred solution of (3R,4S)-tert-butyl 3-acetamido-4-allyl-3-(tert-butylcarbamoyl)pyrrolidine-1-carboxylate (5.51 g, 15 mmol) in anhydrous methylene chloride (80 mL) under nitrogen was treated with chloro-1,5-cyclooctadiene iridium dimer (0.252 g, 0.375 mmol) and 1,2-bis(diphenylphosphino)ethane (0.299 g, 0.75 mmol), stirred for 30 min. and cooled (−20° C.). 4,4,5,5-Tetramethyl-1,3,2-dioxaborolane (3.30 mL, 22.5 mmol) was added dropwise, and the solution was placed in an ice bath and allowed to reach room temperature overnight (18 h). The mixture was quenched with water (75 mL), stirred 15 min, and extracted with ethyl acetate (400 mL, then 2×100 mL). The combined organic solution was washed with saturated aqueous sodium chloride (150 mL), dried (MgSO4), and concentrated. The solid was recrystallized (2 crops) from acetonitrile to afford (3R,4S)-tert-butyl 3-acetamido-3-(tert-butylcarbamoyl)-4-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl)pyrrolidine-1-carboxylate (6.13 g, 82%) as a white solid. NMR (CDCl3) δ 6.40-6.60 (m, 1 H), 6.23 (s, 1 H), 3.95-4.05 (m, 1 H), 3.65-3.75 (m, 2 H), 2.90-3.20 (m, 2 H), 2.00 (s, 3 H), 1.45 (s, 9 H), 1.30-1.45 (m, 4 H), 1.33 (s, 9 H), 1.22 (s, 12 H), 0.70-0.80 (m, 2 H). MS (m+1): 496.4.

后处理

  1. customthe solution was placed in an ice bath
  2. waitto reach room temperature overnight
  3. custom(18 h)
  4. customThe mixture was quenched with water (75 mL)
  5. stirringstirred 15 min
  6. extractionextracted with ethyl acetate (400 mL
  7. washThe combined organic solution was washed with saturated aqueous sodium chloride (150 mL)
  8. dry with materialdried (MgSO4)
  9. concentrationconcentrated
  10. customThe solid was recrystallized (2 crops) from acetonitrile

来源与证据

ORD记录
ord-5647829d1be340b6902342f9d6832a3f
来源数据集
uspto-grants-2016_09
专利号
US09440995B2

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