Diethyl 3-methylcyclopent-3-ene-1,1-dicarboxylate → 3-Methyl-cyclopent-3-enecarboxylic acid

HRID 651923Notes

Reaction equation

HRID 651923 reaction equation
C12CC(CC1)CCO2.[CH3:9][C:10]1[CH2:14][C:13](C(OCC)=O)([C:15]([O:17]CC)=[O:16])[CH2:12][CH:11]=1>>[CH3:9][C:10]1[CH2:14][CH:13]([C:15]([OH:17])=[O:16])[CH2:12][CH:11]=1

Participants

3

Reactant 2

HCID 10977178Diethyl 3-methylcyclopent-3-ene-1,1-dicarboxylateHCID 217024142-Oxabicyclo[3.2.1]octane

Product 1

HCID 125754193-Methyl-cyclopent-3-enecarboxylic acid

Procedure

When m is 1, n is 2 and p is 1, the ring system is a 2-oxabicyclo[3.2.1]octane, another subclass of this invention. For example, compound XIIp ##STR27## in which R2, R5 and R6 are methyl, can be prepared by saponification and decarboxylation of diethyl 1-methylcyclopent-1-ene-4,4-dicarboxylate, prepared by the procedure of E. E. Schweiger and G. J. O'Neill, J. Org. Chem., 30, 2082 (1965), to provide 1 methylcyclopent-1-ene-4-carboxylic acid. The resulting carboxylic acid is homologated in the manner proscribed for the compounds XIp, and subsequently treated similarly to the acid of subclass IX.

Workup

  1. customprepared by the procedure of E

Sources & evidence

ORD record
ord-b0df7a5e643540d2835822deff1a4824
Source dataset
uspto-grants-1987_06
Patent number
US04670041

Reaction notes

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