L. Wick et al., SYNTHESIS AND REACTIONS OF NEW 2-SUBSTITUTED 5-PHENYL-6-OXA-4-AZASPIRO[2,4]-HEPTEN-7-ONE DERIVATIVES, Tetrahedron, 51(37), 1995, pp. 10219-10230
Synthesis, reactions and relative configurations of new 2-halogen-, 2-
acetyl- and 2-pivaloyl-substituted 5-phenyl-6-oxa-4-azaspiro[2,4]hepte
n-7-one derivatives 1a-h as potential precursors of 1-aminocyclopropan
ecarboxylic acids are described.