HCID 20306565, compound → HCID 70583183, compound

HRID 972105Notes

Reaction equation

HRID 972105 reaction equation
[C:1]([O:5][C:6]([C:8]1([CH2:19][C:20]#[C:21][CH2:22][CH3:23])[C:12](=[O:13])[CH:11]=[CH:10][CH:9]1[CH2:14][C:15]([O:17][CH3:18])=[O:16])=[O:7])([CH3:4])([CH3:3])[CH3:2].[H][H]>CC(C)=O.[Pd].CC([O-])=O.CC([O-])=O.[Pb+2]>[C:1]([O:5][C:6]([C:8]1([CH2:19]/[CH:20]=[CH:21]\[CH2:22][CH3:23])[C:12](=[O:13])[CH:11]=[CH:10][CH:9]1[CH2:14][C:15]([O:17][CH3:18])=[O:16])=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

5

Reactant 2

HCID 20306565HCID 20306565, compound2×HCID 178418361HCID 178418361, compound

Product 1

HCID 70583183HCID 70583183, compound

Reagents, catalysts & solvents 2

HCID 131709914Lindlars catalystCatalystHCID 180AcetoneSolvent

Procedure

A 4.5 g quantity of 5-methoxycarbonyl-4-methoxycarbonylmethyl-5-(2-pentynyl)-2-cyclopentenone (compound (1-a)) is dissolved in a mixture of 50 ml of n-hexhane and 50 ml of acetone, and 7 g of a Lindlar catalyst is added to the solution. Hydrogen gas is introduced into the solution with stirring. The reaction is completed when the solution has absorbed the theoretical amount of the gas. On completion of the reaction, the catalyst is filtered off from the reaction mixture, and the filtrate is concentrated at reduced pressure. The residue is distilled in a vacuum, affording 5-methoxycarbonyl-4-methoxycarbonylmethyl-5-(cis-2-pentenyl)-2-cyclopentenone (compound (1-b), R1 =CH3, R2 =CH3) in a yield of 99.8%, b.p. 81°-85° C./0.005 mm Hg.

Workup

  1. additionis added to the solution
  2. customhas absorbed the theoretical amount of the gas
  3. customOn completion of the reaction
  4. filtrationthe catalyst is filtered off from the reaction mixture
  5. concentrationthe filtrate is concentrated at reduced pressure
  6. distillationThe residue is distilled in a vacuum

Sources & evidence

ORD record
ord-77e64be8590c4661a8ca87e679fa5f32
Source dataset
uspto-grants-1979_07
Patent number
US04163111

Reaction notes

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