Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl ester → Ethyl 3-(4-benzyloxy-3-cyclopentyl-phenyl)prop-2-enoate

HRID 471949Notes

Reaction equation

HRID 471949 reaction equation
[CH2:1]([O:8][C:9]1[CH:16]=[CH:15][C:12]([CH:13]=O)=[CH:11][C:10]=1[CH:17]1[CH2:21][CH2:20][CH2:19][CH2:18]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C1(P(C2C=CC=CC=2)(C2C=CC=CC=2)=[CH:29][C:30]([O:32][CH2:33][CH3:34])=[O:31])C=CC=CC=1>ClCCl>[CH2:1]([O:8][C:9]1[CH:16]=[CH:15][C:12]([CH:13]=[CH:29][C:30]([O:32][CH2:33][CH3:34])=[O:31])=[CH:11][C:10]=1[CH:17]1[CH2:21][CH2:20][CH2:19][CH2:18]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

4

Reactant 2

HCID 70670Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl esterHCID 593950074-Benzyloxy-3-cyclopentyl-benzaldehyde

Product 1

HCID 67455985Ethyl 3-(4-benzyloxy-3-cyclopentyl-phenyl)prop-2-enoateYield 81%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of 4-benzyloxy-3-cyclopentyl-benzaldehyde (1.3 g, 4.64 mmol) and ethyl 2-triphenylphosphoranylideneacetate (1.6 g, 4.64 mmol) in dichloromethane (12 mL) was heated at reflux for 24 h. The reaction was cooled to room temperature and concentrated in vacuo. Purification by silica gel chromatography (0-10% ethyl acetate/hexanes) yielded ethyl 3-(4-benzyloxy-3-cyclopentyl-phenyl)prop-2-enoate (1.2 g, 81% yield). 1H NMR (400.0 MHz, DMSO-d6) δ 7.61-7.57 (m, 2H), 7.52 (dd, J=2.1, 8.5 Hz, 1H), 7.46-7.39 (m, 4H), 7.33 (t, J=7.1 Hz, 1H), 7.06 (d, J=8.5 Hz, 1H), 6.49 (d, J=16 Hz, 1H), 5.18 (s, 2H), 4.16 (q, J=7.1 Hz, 2H), 3.32-3.27 (m, 1H), 1.99-1.92 (m, 2H), 1.74-1.67 (m, 2H), 1.65-1.58 (m, 4H), 1.24 (t, J=7 Hz, 3H).

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 24 h
  3. concentrationconcentrated in vacuo
  4. customPurification by silica gel chromatography (0-10% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-1211caa33cde45e188e7168d61dc095b
Source dataset
uspto-grants-2014_01
Patent number
US08633189B2

Reaction notes

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