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Polonovski-type rearrangement

The acylation of 1,4-benzodiazepine 4-oxides, e.g. (230), leads to a Polonovski-type rearrangement giving (231) and provides a useful way of functionalizing the 3-position. Treatment of (230) with p-toluenesulfonyl chloride gives the quinoxalone (233) via a Beckmann type of rearrangement (72JHC747, p. 755) and similar rearrangements have been observed in the reactions of 4-hydroxy derivatives with thionyl chloride or phosphorus oxychloride. [Pg.617]

B. Silicon-Induced Pummerer-Type and Polonovski-Type Rearrangements... [Pg.220]

Polonovski-type rearrangement 31,137 3-IndazoIone ring, 1,2-ditaydro-... [Pg.285]

Without additional reagents Polonovsky-type rearrangement of 1-alkylindazole 2-oxides... [Pg.375]

The chemical conversion of alkaloids of the vobasine type into those of the ervatamine type can readily be effected, using a modified Polonovski reaction. This involves formation of an N-oxide and its rearrangement, using trifluoroacetic anhydride as reagent. Dregamine (65) has been converted into 20-epi-ervatamine... [Pg.14]

See other pages where Polonovski-type rearrangement is mentioned: [Pg.75]    [Pg.261]    [Pg.272]    [Pg.75]    [Pg.261]    [Pg.272]    [Pg.356]    [Pg.2251]   
See also in sourсe #XX -- [ Pg.222 , Pg.223 ]



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Polonovski rearrangement

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