Synthetic Studies of the Formation of Oxazoles and Isoxazoles from N-Acetoacetyl Derivatives: Scope and Limitations
摘要:
[GRAPHICS]The preparation of two types of heterocycles, oxazoles and isoxazoles, were achieved in good yields in a rapid and simple way by using N-acetoacetyl derivatives. Steric and electronic effects caused by the nature of the substituents at C1, C2, and C3 were studied. The best results were obtained with a chiral oxazolidinone moiety on C1 derived from (1R,2S)-(-) norephedrine.