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Preparation of 3-(2H-pyran-2-on-6-yl)indolizines and the diels-alder reactions with some olefinic and acetylenic dienophiles |
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| Authors: | Tetsuro Shimo Masayuki Ohe Kenichi Somekawa Otohiko Tsuge |
| Abstract: | 3-(2H-Pyran-2-on-6-yl)indolizines 6a-d were prepared by 1,3-dipolar cycloaddition reactions of N-(2H-pyran-2-on-6-yl)methylpyridinium bromides 5a,b with dimethyl acetylenedicarboxylate (DMAD). All of the cycloaddition reactions of 6b with N-phenylmaleimide, p-benzoquinone, and DMAD took place at the 2-pyrone ring to give 3-substituted indolizines. |
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