Lithium 3-lithio-3-tosylpropanoate: A useful α-tosylated homoenolate anion

Article abstract of DOI:10.1016/0040-4039(92)88101-A

Lithium 3-lithio-3-tosylpropanoate prepared by dilithiation of 3-tosylpropanoic acid with n-butyllithium at -78°C, reacts with different electrophiles yielding the expected 3-functionalized tosylated propanoic acids. When carbonyl compounds are used as electrophiles the corresponding α,β-butenolides are prepared directly.