Synthesis and carbon-13 nmr of an unusual tricyclic barbituric acid derivativet

Academic Article

Abstract

  • Bicyclic imides of the type illustrated in general structure 1 are of interest because they belong to a class of anti-Bredt bridgehead nitrogen amides.1 These compounds were first proposed as potential stereoselective anticonvulsants by E. E. Smissman, whose synthetic efforts2-11 revealed that structures with n = 1 were very resistant to formation. For example, despite numerous attempts by Smissman to prepare 1a (n = 1) or analogues, 6-8 the only reported success6 was for the preparation of methoxy-substituted bicyclic barbiturate 4 using the procedure illustrated in Scheme I. Surprisingly, similar synthetic approaches involving intermediates without the methoxy group, such as 5 in Scheme I, did not yield la. Our interest2 in these systems prompted us to repeat Smissman's synthesis of 4. Here we report that the structural assignments for 4 and the immediate synthetic precursor 3 are incorrect, and we provide NMR evidence which shows that the correct structures are novel cyclized barbituric acid derivatives containing the amide acetal functionality. © 1984, American Chemical Society. All rights reserved.
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    Digital Object Identifier (doi)

    Author List

  • Brouillette WJ; Friedrich JD; Muccio DD
  • Start Page

  • 3227
  • End Page

  • 3230
  • Volume

  • 49
  • Issue

  • 17