Reactions of 5-substituted (S)-1-acyl-3-[(E)-(dimethylamino)-methylidene]pyrrolidine-2-ones and (S)-3-[(E)-(dimethylamino)methylidene]tetrahydrofuran-2-ones with amines. Preparation of intermediates in the 'ring switching' synthesis of heteroarylalanine- and heteroaryllactic acid derivatives and their analogs
M. Skof et al., Reactions of 5-substituted (S)-1-acyl-3-[(E)-(dimethylamino)-methylidene]pyrrolidine-2-ones and (S)-3-[(E)-(dimethylamino)methylidene]tetrahydrofuran-2-ones with amines. Preparation of intermediates in the 'ring switching' synthesis of heteroarylalanine- and heteroaryllactic acid derivatives and their analogs, ACTA CHIM S, 46(4), 1999, pp. 567-586
5-Substituted (S)-1-acyl-3-[(E)-(dimethylamino)methylidene]pyrrolidin-2-one
s 1-3 and (S)-3-[(E)-(dimethylamino)methylidene]-5-(methoxycarbonyl)tetrahy
drofuran-2-one 4, chiral cyclic analogs of 2-substituted alkyl 3-(dimethyla
mino)propenoates, were treated with alkyl, aryl, and heteroarylamines 6-25
under mild conditions to give 5-substituted (S)-3-[(substituted amino)methy
lidene]pyrrolidin-2-ones 26-47 and (S)-3-[(E)-(substituted amino)methyliden
e]-tetrahydrofuran-2-ones 48-52 as intermediates in a 'ring switching' synt
hesis of 3-heteroarylalanine- and 3-heteroaryllactic acid derivatives and t
heir analogs.