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Reactions of carbene intermediates from the reaction of trialkyl phosphites with dialkyl benzoylphosphonates: Intramolecular cyclisations of 2-substituted dialkyl benzoylphosphonates

DOI: 10.1039/p19960000555

Source and publish data:

Journal of the Chemical Society. Perkin transactions I p. 555 - 561 (1996)

Update date:2022-07-31

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Authors:

Griffiths, D. VaughanGriffiths, D. Vaughan

Griffiths, Penelope A.Griffiths, Penelope A.

Karim, KhalkuKarim, Khalku

Whitehead, Belinda J.Whitehead, Belinda J.

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Article abstract of DOI:10.1039/p19960000555

The reaction of dialkyl benzoylphosphonates 1 with trialkyl phosphites leads to the formation of carbene intermediates 3 via the anionic intermediates 2. The carbene intermediates 3 (R = 2-PhO, 2-PhOCH2, and 2-PhS) have been generated by heating the corresponding 2-substituted dialkyl benzoylphosphonates with trimethyl phosphite and their subsequent reactions investigated. Reactions proceed either by intermolecular trapping of the carbene intermediates by trimethyl phosphite to give novel ylidic phosphonates 4, or by intramolecular routes involving carbene insertion into the π-system of the phenyl ring in the substituent. Studies using methyl-substituted derivatives have shown that the formation of the thioxanthenylphosphonate 15 (X = S, R′ = R″ = Me) proceeds via a spiro diene intermediate 14 (X = S, R′ = R″ = Me).

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Product name:(2-Phenylsulfanyl-benzoyl)-phosphonic acid dimethyl ester

Cas No:176509-21-0

176509-21-0

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