Sodium hydride → trans-N-Boc-4-(4-bromo-benzyloxy)-L-proline

HRID 49968

反応式

HRID 49968 の反応式
N1CCC[C@H]1C(O)=O.[H-].[Na+].C[O:12][C:13](=[O:27])[C@@H:14]1[CH2:18][C@@H:17]([OH:19])[CH2:16][N:15]1[C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21].[Br:28][C:29]1[CH:36]=[CH:35][C:32]([CH2:33]Br)=[CH:31][CH:30]=1>C1COCC1.O>[C:20]([N:15]1[CH2:16][C@H:17]([O:19][CH2:33][C:32]2[CH:35]=[CH:36][C:29]([Br:28])=[CH:30][CH:31]=2)[CH2:18][C@H:14]1[C:13]([OH:12])=[O:27])([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21]

参加物

7

反応物 4

HCID 24758Sodium hydrideHCID 685274-Bromobenzyl bromideHCID 145742L-ProlineHCID 2734883(2S,4R)-4-Hydroxypyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester

生成物 1

HCID 21301025trans-N-Boc-4-(4-bromo-benzyloxy)-L-proline収率 30.6%

試薬・触媒・溶媒 2

HCID 962Water溶媒HCID 8028Tetrahydrofuran溶媒3 回

実験手順

The compound of formula (P5), wherein R′ is 4-Bromo and the bonds linking the benzyloxy and methyl ester groups (depicted in P5 as wavy bonds) define the trans, L-proline configuration (2S,4R) was prepared as follows. To a suspension of sodium hydride (60% in oil) (0.12 g) (1.5 eq.) in 5 mL of dry THF was added trans-N-Boc-4-hydroxy-L-proline methyl ester (0.5 g) in 5 mL of dry THF. The reaction mixture was stirred for 45 minutes and a solution of 4-bromobenzyl bromide (0.75 g) (1.5 eq.) in 5 mL of dry THF was added. The reaction mixture was refluxed for 3 hours. After cooling to RT, the reaction mixture was diluted with water and extracted with EtOAc. The aqueous layer was acidified and extracted with DCM. The combined organic extracts were washed with water, dried over MgSO4, and evaporated under reduced pressure to afford trans-N-Boc-4-(4-bromo-benzyloxy)-L-proline (0.25 g). NMR (CDCl3, 200 MHz): 7.47 (2H, d), 7.2 (2H, d), 4.50-4.30 (3H, m), 4.25-4.1 (1H, m), 3.75 (3H, s), 3.8-3.5 (2H, m), 2.5-2.3 (1H, m), 2.15-1.95 (1H, m), 1.5-1.35 (9H).

後処理

  1. customwas prepared
  2. temperatureThe reaction mixture was refluxed for 3 hours
  3. extractionextracted with EtOAc
  4. extractionextracted with DCM
  5. washThe combined organic extracts were washed with water
  6. dry with materialdried over MgSO4
  7. customevaporated under reduced pressure

出典と根拠

ORDレコード
ord-59fd0c8b41fd4daf9a19a813bf25f45f
出典データセット
uspto-grants-2004_03
特許番号
US06710064B2

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