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Fries carbamoyl transfer

Anionic Fries carbamoyl transfer.1 Treatment of the biphenyl 2-O-carbamate 1 in which the ortho-position is protected by a methoxyl or triethylsilyl (TES) group with L.DA results in transfer of the carbamoyl group to form the biphenyl 2. Cyclization of... [Pg.165]

Af,Af-Dimethylcarbamates are unstable once ortholithiated, and rearrange rapidly by a carbamoyl transfer mechanism known as the anionic ortfio-Fries rearrangement . With Af,Af-diethylcarbamates, this rearrangement can be controlled the ortholithiated carbamate 64 is stable at —78°C but, on warming to room temperamre, rearranges to give a 2-hydroxybenzamide 65 (Scheme 33) °. ... [Pg.517]

See other pages where Fries carbamoyl transfer is mentioned: [Pg.44]   
See also in sourсe #XX -- [ Pg.165 ]

See also in sourсe #XX -- [ Pg.165 ]



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