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Phosphorus Oxide cyclodehydrations

Sulfur dioxide phosphorus pent oxide Cyclodehydration... [Pg.266]

CYCLODEHYDRATION Methanesulfonic acid. Phosphorus(V) oxide-Hexamethyl-disiloxane. Phosphorus(V) oxide-Methanesulfonic acid. Polyphosphate ester. [Pg.647]

The key to this approach was the formation of the oxazole ring in the presence of the thiazoline rings. Cyclization of 1298 with Burgess reagent" gave the expected intermediate oxazoline (not shown), but this could not be oxidized to 1299 using Ni02, NBS/benzoyl peroxide, or CuBr/tert-butyl perbenzoate. Thionyl chloride, phosphorus oxychloride, titanium tetrachloride, or triphenylphosphine/iodine did not effect cyclodehydration of the p-ketoamide produced from the Dess-Martin periodinane oxidation. [Pg.288]

See other pages where Phosphorus Oxide cyclodehydrations is mentioned: [Pg.898]    [Pg.898]    [Pg.651]    [Pg.468]    [Pg.72]    [Pg.504]    [Pg.466]    [Pg.72]    [Pg.237]   
See also in sourсe #XX -- [ Pg.342 ]



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Cyclodehydration

Phosphorus oxidative

Phosphorus oxides

Phosphorus oxids

Phosphorus, oxidation

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