Methoxymethylenetriphenylphosphine is a Wittig reagent with used as an reagent in the homologization of aldehydes and ketones to extended aldehydes, an organic reaction first reported in 1958 [1].
The reagent can be prepared (scheme 1) by reaction of triphenylphosphine 1 with chloromethyl methyl ether 2 in diethyl ether to the phosphonium salt 3. This salt is deprotonated to the phosphonium ylide Methoxymethylenetriphenylphosphine 4 by phenyllithium.
This reagent reacts with a ketone or aldehyde 5 in a Wittig reaction to the enol ether 6 which can be converted to the aldehyde 7 by the application of an acid.
The reaction has been applied to tigogenone (scheme 2) and in the Wender Taxol total synthesis.
References
- ^ A new aldehyde synthesis Samuel G. Levine J. Am. Chem. Soc.; 1958; 80(22); 6150-6151. Abstract