Synthesen und Untersuchungen von [Oxazolo[2,3-a]isoindol-9b(2H)-yl]phosphonaten und -phosphinaten: Eine neue Klasse von Heterocyclen

Synthesis and antiproliferative activity of [2-(phthaloylamino)alkyl]triphenyl phosphonium derivatives against K562 cell line

Given the reported cytotoxicity of phthaloylaminoethyltriphenylphosphonium bromide 2a in the P-388 cell line, we have developed new [2-(phthaloylamino)alkyl]phosphonium derivatives 2b-e and evaluated their cytotoxic activity. These compounds have been synthetized from N,N-phthaloylaminoalcohols and triphenylphosphonium hydrobromide via a one-pot reaction. 2a was found inactive in the K562 cell line, but 2c-e exhibited a cytotoxic activity with IC50 values about 1 microM.

Reaction of o-oxazolinylphenyllithium with carbon monoxide. Carbonylative cyclization via an aroyllithium intermediate

The carbonylation of a phenyllithium containing an oxazoline group at the ortho position, followed by quenching with water, afforded a tricyclic compound, 3,3-dimethyl-2,3-dihydrooxazolo[2, 3-a]isoindol-5(9bH)-one, in 91% yield. This reaction proceeded via an intramolecular cyclization of the aroyllithium species, to give the tricyclic dienolate. Treatment of the tricyclic dienolate with electrophiles, such as alkyl halides, aldehydes, ketones, and epoxides gave the substituted oxazolo[2,3-a]isoindolinones in good yield.