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Migration alkoxycarbonyl groups

Six-membered Rings.— The versatility of 1,3-dipolar cycloadditions and of hetero-Diels-Alder reactions is, once again, used to great effect for the synthesis of 1,2-oxazine derivatives. Useful, multifunctionalized heterocycles are obtained by reaction of nitrile oxides with sulphoxonium allylides, followed by conversion of the initially formed furans (257) to oxazines (258) by treatment with tosic acid. Treatment with NEts causes migration of the alkoxycarbonyl group forming the pyrrolone (259). [Pg.359]

Not only alky] groups, but also aryl [492, 493], vinyl [494], acyl [276, 495—497], alkoxycarbonyl [498], aminocarbonyl [499-501], silyl [502-504], or phosphoryl groups [279, 280] can migrate to a vicinal carbanion (Scheme 5.68). Because some of these groups can be used to stabilize a-heteroatom-substituted carbanions by chelate formation, migration of these groups to the carbanion is a potential side reaction in the generation and alkylation of chelate-stabilized carbanions. [Pg.194]

Azidoformates react with unsaturated ethers in the presence of [PdCPhCNjaC ] to give l-alkoxy-l-(alkoxycarbonylimino)alkanes, a reaction which with certain substrates is accompanied by methyl group migration to give alkoxycarbonyl-aziridines (Scheme 44). ... [Pg.252]

See other pages where Migration alkoxycarbonyl groups is mentioned: [Pg.548]    [Pg.253]    [Pg.212]    [Pg.455]    [Pg.212]    [Pg.19]    [Pg.27]    [Pg.255]    [Pg.176]    [Pg.256]    [Pg.1700]    [Pg.718]    [Pg.397]    [Pg.53]    [Pg.2336]    [Pg.139]    [Pg.52]    [Pg.718]    [Pg.203]    [Pg.594]    [Pg.82]    [Pg.248]    [Pg.561]    [Pg.130]   
See also in sourсe #XX -- [ Pg.548 ]

See also in sourсe #XX -- [ Pg.548 ]

See also in sourсe #XX -- [ Pg.98 , Pg.548 ]



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Alkoxycarbonyl

Alkoxycarbonyl group

Alkoxycarbonylation

Group migration

Migrating group

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