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1,5-Dibromopentane → (R)-(+)-6-[(5-bromopentyl)oxy]-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester

HRID 2232495
ノート
印刷プレビュー

反応式

HRID 2232495 の反応式
[CH3:1][O:2][C:3]([C@@:5]1([CH3:19])[CH2:10][CH2:9][C:8]2[C:11]([CH3:18])=[C:12]([OH:17])[C:13]([CH3:16])=[C:14]([CH3:15])[C:7]=2[O:6]1)=[O:4].C(=O)([O-])[O-].[K+].[K+].C1OCCOCCOCCOCCOCCOC1.[Br:44][CH2:45][CH2:46][CH2:47][CH2:48][CH2:49]Br>O.CCOCC.C(#N)C>[CH3:1][O:2][C:3]([C@@:5]1([CH3:19])[CH2:10][CH2:9][C:8]2[C:11]([CH3:18])=[C:12]([O:17][CH2:49][CH2:48][CH2:47][CH2:46][CH2:45][Br:44])[C:13]([CH3:16])=[C:14]([CH3:15])[C:7]=2[O:6]1)=[O:4]
参加物実験手順後処理出典と根拠反応ノート

参加物

8

反応物 4

HCID 81001,5-DibromopentaneHCID 11430Potassium CarbonateHCID 2855718-Crown-6HCID 14308591(R)-(+)-methyl 3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylate

生成物 1

HCID 14329716(R)-(+)-6-[(5-bromopentyl)oxy]-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester

試薬・触媒・溶媒 3

HCID 962
Water
溶媒
HCID 3283Diethyl Ether溶媒
HCID 6342Acetonitrile溶媒

実験手順

A mixture of 6.5 g (24.6 mmoles) of (R)-(+)-6-hydroxy-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester, 10.37 g (75.1 mmoles) of anhydrous potassium carbonate, 1.12 g of 18-crown-6, 39.3 ml (0.2 mole) of 1,5-dibromopentane, and 150 ml of acetonitrile was stirred and refluxed for 21 hours. After being cooled, the mixture was treated with ether and water. The organic layer was separated, washed with water and brine, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue (68 g) was purified first by column chromatography on silica gel (400 g; eluting with 49:1 toluene-ethyl acetate) and then by preparative HPLC on silica gel using 9:1 hexane-ethyl acetate as the mobile phase. There was obtained 9.71 g (95.6%) or (R)-(+)-6-[(5-brompentyl)oxy]-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester as a solid. Recrystallization from ethanol gave a colorless solid mp 64°- 65.5° C., [α]D25 +36.37° (c 2, CHCl3).

後処理

  1. temperaturerefluxed for 21 hours
  2. temperatureAfter being cooled
  3. customThe organic layer was separated
  4. washwashed with water and brine
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customThe residue (68 g) was purified first by column chromatography on silica gel (400 g; eluting with 49:1 toluene-ethyl acetate)

出典と根拠

ORDレコード
ord-a7ff44945d974caabaee27066cec27cc
出典データセット
uspto-grants-1988_11
DOI
10.6084/m9.figshare.5104873.v1
特許番号
US04788214

反応ノート

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