Cycloadditions. 48. Novel heterocycles by bis heteroannulation of oxazoles
摘要:
We report the first examples of intramolecular Diels-Alder addition of heterodienophiles N = N, C =N, C = O, C = S to oxazoles. The required 5-ethoxy- and 5-phenyloxazoles were synthesized bearing a side chain of variable length on C-2 to which the different heterodienophiles are attached. The products of the thermal bis heteroannulation are 3-triazolines, imidazolines, oxazolines, or thiazolines fused to a five- to six-membered ring. Relative reactivities were established and the mechanism is discussed.
Cycloadditions. 48. Novel heterocycles by bis heteroannulation of oxazoles
摘要:
We report the first examples of intramolecular Diels-Alder addition of heterodienophiles N = N, C =N, C = O, C = S to oxazoles. The required 5-ethoxy- and 5-phenyloxazoles were synthesized bearing a side chain of variable length on C-2 to which the different heterodienophiles are attached. The products of the thermal bis heteroannulation are 3-triazolines, imidazolines, oxazolines, or thiazolines fused to a five- to six-membered ring. Relative reactivities were established and the mechanism is discussed.
Cycloadditions. 48. Novel heterocycles by bis heteroannulation of oxazoles
作者:A. Hassner、B. Fischer
DOI:10.1021/jo00010a044
日期:1991.5
We report the first examples of intramolecular Diels-Alder addition of heterodienophiles N = N, C =N, C = O, C = S to oxazoles. The required 5-ethoxy- and 5-phenyloxazoles were synthesized bearing a side chain of variable length on C-2 to which the different heterodienophiles are attached. The products of the thermal bis heteroannulation are 3-triazolines, imidazolines, oxazolines, or thiazolines fused to a five- to six-membered ring. Relative reactivities were established and the mechanism is discussed.