Ethyl diazoacetate → Cyclooctyloxyacetic Acid Ethyl Ester

HRID 18813

Reaction equation

HRID 18813 reaction equation
[CH:1]1([OH:9])[CH2:8][CH2:7][CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.[N+](=[CH:12][C:13]([O:15][CH2:16][CH3:17])=[O:14])=[N-]>ClCCl.CCOCC.CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.[Rh].[Rh]>[CH2:16]([O:15][C:13](=[O:14])[CH2:12][O:9][CH:1]1[CH2:8][CH2:7][CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1)[CH3:17]

Participants

6

Reactant 2

HCID 12192Ethyl diazoacetateHCID 12766Cyclooctanol

Product 1

HCID 68567541Cyclooctyloxyacetic Acid Ethyl EsterYield 37.8%

Reagents, catalysts & solvents 3

HCID 423677Acetic acid, rhodium salt (4:2)CatalystHCID 3283Diethyl EtherSolventHCID 6344DichloromethaneSolvent

Procedure

To a solution of cyclooctanol (640 mg, 4.9 mmol) in dichloromethane (15 mL) is added rhodium (II) acetate dimer (21 mg) followed by ethyl diazoacetate (0.60 g, 5.7 mmol). The reaction mixture is stirred at RT for 10 min. The reaction mixture is rotary evaporated, and the residue dissolved in Et2O, filtered through Celite, and the filtrate is evaporated and the residue is vacuum distilled at 150° C. to give 397 mg of the product 413. 1H NMR (CDCl3) δ 4.21 (q, 2H), 4.06 (s, 2H), 3.50 (m, 1H), 1.93 (m, 2H), 1.7-1.4 (m, 8H), 1.4-1.3 (m, 2H), 1.28 (t, 3H); MS: m/z 215 (M++1).

Workup

  1. filtrationfiltered through Celite
  2. customthe filtrate is evaporated
  3. distillationdistilled at 150° C.

Sources & evidence

ORD record
ord-37aa2452595246e29300b5370e97e95d
Source dataset
uspto-grants-2010_06
Patent number
US07741493B2

Linked notes

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