Bromocyclopentane → Tert-butyl 2-cyclopentyl-2-(4-methylphenyl)acetate

HRID 2210561Notes

Reaction equation

HRID 2210561 reaction equation
CC(C)([O-])C.[K+].[CH3:7][C:8]1[CH:13]=[CH:12][C:11]([CH2:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])=[CH:10][CH:9]=1.[CH:22]1(Br)[CH2:26][CH2:25][CH2:24][CH2:23]1>CN(C=O)C>[CH:22]1([CH:14]([C:11]2[CH:10]=[CH:9][C:8]([CH3:7])=[CH:13][CH:12]=2)[C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:26][CH2:25][CH2:24][CH2:23]1

Participants

5

Reactant 3

HCID 8728BromocyclopentaneHCID 12362014tert-Butyl (4-methylphenyl)acetateHCID 23665647Potassium tert-butoxide

Product 1

HCID 15234721Tert-butyl 2-cyclopentyl-2-(4-methylphenyl)acetate

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent3×

Conditions

Temperature
0 °C

Procedure

33.5 g (0.3 mol) of potassium tert-butoxide are initially introduced at 0° C. into 100 ml of DMF with exclusion of moisture, and 51.6 g (0.25 mol) of tert-butyl 4-methylphenylacetate in 250 ml of DMF are added dropwise. The mixture is stirred at 0° C. for 30 min and 32.2 ml (0.3 mol) of cyclopentyl bromide in 150 ml of DMF are added dropwise at 5°-15° C. and the mixture is stirred at 25° C. for 20 h. After concentration, the residue is partitioned between water/diethyl ether, and the ether phase is dried over sodium sulphate and concentrated. The product crystallizes out.

Workup

  1. additionare added dropwise
  2. stirringthe mixture is stirred at 25° C. for 20 h
  3. concentrationAfter concentration
  4. customthe residue is partitioned between water/diethyl ether
  5. dry with materialthe ether phase is dried over sodium sulphate
  6. concentrationconcentrated
  7. customThe product crystallizes out

Sources & evidence

ORD record
ord-1d4db8f04b2d44cbb432382e18074a17
Source dataset
uspto-grants-1995_10
Patent number
US05459156

Reaction notes

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