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2,3,5,6-tetramethylmorpholine. VI. Cyclization of N-substituted 3,3′-iminobis-2-butanols

✍ Scribed by Sven Hernestam; Gillis Stenvall

Book ID
118284404
Publisher
Journal of Heterocyclic Chemistry
Year
1980
Tongue
English
Weight
252 KB
Volume
17
Category
Article
ISSN
0022-152X

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2,3,5,6-Tetramethylmorpholine: II—1H n.m
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## Abstract The structures of the six isomers of 2,3,5,6‐tetramethyl‐morpholine have been determined by means of proton nuclear magnetic resonance studies at 100 MHz. The spectra have been analysed in terms of spin–spin coupling constants and population distributions of the possible conformers at l

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The synthesis of 3,3-dimethylmorpholine-2,5-diones 4a was achieved conveniently via the direct amide cyclization of the linear precursors of type 3, which were prepared by coupling of 2,2-dimethyl-2H-azirin-3-amines 2 with 2-hydroxyalkanoic acids 1. Thionation of 4a with Lawessons reagent yielded th