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4H-1,3-Oxazines

As pointed out previously (Section II,B,l,e), 2-amino-5,6-dihydro-4H- 1,3-oxazines are tautomeric with 2-imino-tetrahydro-1,3-oxazines125 [Eq. (23)]. [Pg.40]

Reported Yields (%) or 4H-1,3-Oxazine Derivatives (87) and Acvlaminoketones (88) Obtained through Nitrilium Salts0... [Pg.122]

Addition to the side-chain of the aldimine from 4-anisaldehyde and aniline occurred in its reaction with the furan-2,3-dione shown with toss of carbon monoxide by heating in benzene during 2 hours to give 2-(4-methoxy-phenyl)-3,6-diphenyl-2,3-dihydro-4H-1,3-oxazine-4-one in 93% yield (ref.131)... [Pg.100]

C1bH1eBrNO, 2-Phenyl-4-(4-bromophenyl)-5,6-dimethyl-5,6-dihydro-4H-1,3-oxazine, 39B, 262... [Pg.190]

Benzyl-4,4,6-trimethyl-5,6-dihydro-4H-1,3-oxazine dissolved in tetrahydro-furan-ethanol (1 1), 9 N HGl added to pH 7, then aq. NaBH4 added at -30° with simultaneous addition of more HGl to keep the pH at 7, and stirred 1 hr. at -30° after the addition 2-benzyl-4,4,6-trimethyltetrahydro-l,3-oxazine. Y 88%. - Via this reduction, aldehydes, inch deuterioaldehydes, can be prepared from carboxylic acids and nitriles. F. e. s. A. I. Meyers and A. Nabeya, Ghem. Gommun. 1967, 1163. [Pg.338]


See other pages where 4H-1,3-Oxazines is mentioned: [Pg.725]    [Pg.980]    [Pg.146]    [Pg.373]    [Pg.393]    [Pg.621]    [Pg.1007]    [Pg.802]    [Pg.1462]    [Pg.2387]    [Pg.1463]    [Pg.2608]    [Pg.203]    [Pg.290]    [Pg.579]    [Pg.867]    [Pg.1518]    [Pg.1462]    [Pg.2031]    [Pg.753]    [Pg.1239]    [Pg.2509]    [Pg.2509]    [Pg.2509]    [Pg.323]    [Pg.212]    [Pg.823]    [Pg.693]    [Pg.188]   


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4H-1,3-Oxazin

4H-1,3-Oxazin

5,6-Dihydro-4H-l,3-oxazines

5.6- Dihydro-4H-l,3-oxazine

Aldehydes from 2-Benzyl-4,4,6-trimethyl-5,6-dihydro, 3(4H)-oxazine 1-Phenylcyclopentanecarboxaldehyde

Bromo-5,6-diphenyl-2,3,5,6-tetrahydro-4H-oxazin-2-one

Butoxycarbonyl-5,6-diphenyl-2,3,5,6-tetrahydro-4H-oxazin-2-one

Dihydro-4H-1,3-oxazines

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