Boron trifluoride etherate → (2S,4R)-4-tert-butoxy-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid benzyl ester

HRID 1006835ノート

反応式

HRID 1006835 の反応式
[CH2:1]([O:8][C:9]([C@@H:11]1[CH2:15][C@@H:14]([OH:16])[CH2:13][N:12]1[S:17]([C:20]1[CH:29]=[CH:28][C:27]2[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=2)[CH:21]=1)(=[O:19])=[O:18])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.B(F)(F)F.CCOCC.[CH3:39][C:40](=[CH2:42])[CH3:41].C(=O)(O)[O-].[Na+]>ClCCl>[CH2:1]([O:8][C:9]([C@@H:11]1[CH2:15][C@@H:14]([O:16][C:40]([CH3:42])([CH3:41])[CH3:39])[CH2:13][N:12]1[S:17]([C:20]1[CH:29]=[CH:28][C:27]2[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=2)[CH:21]=1)(=[O:19])=[O:18])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

参加物

6

反応物 4

HCID 8000Boron trifluoride etherateHCID 8255IsobutyleneHCID 516892Sodium BicarbonateHCID 69430249(2S,4R)-4-hydroxy-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid benzyl ester

生成物 1

HCID 69433308(2S,4R)-4-tert-butoxy-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid benzyl ester

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

反応条件

温度
-20 °C

実験手順

Tert-Butyletherification: To a solution of (2S,4R)-4-hydroxy-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid benzyl ester (14.8 g) in dichloromethane (140 ml) were added boron trifluoride ethyl etherate (3 ml) and isobutylene (cooled and liquefied at −30° C., 170 ml) at −30° C. The turbid reaction mixture was stirred at −20° C. for 2 h, poured onto a saturated sodium bicarbonate solution, and extracted with dichloromethane. The organic phases were washed with water, dried over magnesium sulphate and concentrated. The residue was chromatographed on silica gel using EtOAc/hexane 1:4 and 1:2 as eluents to obtain (2S,4R)-4-tert-butoxy-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid benzyl ester (16.4 g) as a glassy syrup, MS: 467 (M).

後処理

  1. customThe turbid reaction mixture
  2. extractionextracted with dichloromethane
  3. washThe organic phases were washed with water
  4. dry with materialdried over magnesium sulphate
  5. concentrationconcentrated
  6. customThe residue was chromatographed on silica gel

出典と根拠

ORDレコード
ord-ec731da895bb443e99c66ab6b5e97401
出典データセット
uspto-grants-2004_09
特許番号
US06790860B2

反応ノート

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