4-Chlorophenol → (1R,2R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-(4-chloro-phenoxymethyl)-cyclopentanecarboxylic acid ethyl ester

HRID 1367487

Reaction equation

HRID 1367487 reaction equation
[CH2:1]([O:3][C:4]([C@@H:6]1[CH2:10][CH:9]([O:11][Si:12]([C:15]([CH3:18])([CH3:17])[CH3:16])([CH3:14])[CH3:13])[CH2:8][C@H:7]1[CH2:19][OH:20])=[O:5])[CH3:2].[Cl:21][C:22]1[CH:27]=[CH:26][C:25](O)=[CH:24][CH:23]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(OC(N=NC(OC(C)(C)C)=O)=O)(C)(C)C>ClCCl.O1CCCC1>[CH2:1]([O:3][C:4]([C@@H:6]1[CH2:10][CH:9]([O:11][Si:12]([C:15]([CH3:16])([CH3:18])[CH3:17])([CH3:13])[CH3:14])[CH2:8][C@H:7]1[CH2:19][O:20][C:25]1[CH:26]=[CH:27][C:22]([Cl:21])=[CH:23][CH:24]=1)=[O:5])[CH3:2]

Participants

7

Reactant 4

HCID 46844-ChlorophenolHCID 11776TriphenylphosphineHCID 97268Di-tert-butyl azodicarboxylateHCID 59619451(1R,2R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-hydroxymethyl-cyclopentanecarboxylic acid ethyl ester

Product 1

HCID 66918824(1R,2R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-(4-chloro-phenoxymethyl)-cyclopentanecarboxylic acid ethyl esterYield 89.1%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent2×

Procedure

To a cold (ice bath) mixture of (1R,2R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-hydroxymethyl-cyclopentanecarboxylic acid ethyl ester (epimeric mixture, 250 mg), 4-chlorophenol (136 mg) and triphenylphoshine (256 mg) in dichloromethane (4 mL) and tetrahydrofuran (1.5 mL) was slowly added a solution of di-tert-butyl-azodicarboxylate (225 mg) in tetrahydrofuran (2.5 mL). The reaction mixture was stirred at room temperature for 2.5 days then concentrated in vacuo and the residue was purified by flash chromatography on silica gel with a gradient of cyclohexane/ethylacetate (1:0 to 9:1 v/v) as eluant to afford the title compound (0.304 g, 89%) as light yellow oil. MS (EI): 413.2 (M+H)+.

Workup

  1. concentrationthen concentrated in vacuo
  2. customthe residue was purified by flash chromatography on silica gel with a gradient of cyclohexane/ethylacetate (1:0 to 9:1 v/v) as eluant

Sources & evidence

ORD record
ord-27f1c92ebdf241fbafe0612350b0f654
Source dataset
uspto-grants-2011_02
Patent number
US07893099B2

Linked notes

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