High Pressure Intramolecular Diels–Alder Reactions of Vinylsulfonates and Vinylsulfonamides
✍ Scribed by Bernd Plietker; Dieter Seng; Roland Fröhlich; Peter Metz
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- French
- Weight
- 138 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0040-4020
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📜 SIMILAR VOLUMES
A variety of substituted furans a-6J undergo the intramolecular Die&Alder reaction at high pressure (12.5 kbar) to provide oxatricyclo adducts Q-12) within 24 hours at room temperature.
## Abstract For Abstract see ChemInform Abstract in Full Text.
Enantiomerically pure dand g-sultams have been prepared by intramolecular [4+2] cycloaddition of N-1-phenylethyl substituted vinylsulfonamides with purely thermal activation and under high pressure. An optimized procedure for reductive debenzylation of the resultant d-sultams is also reported.
Hetero Diels-Alder reactions / Enamino ketones 1 High-pressure reactions / Pyrans The hetero Diels-Alder reaction of enamino ketone 1 with the vinyl ethers 7-11 leading to the dihydropyrans 12a-e and 13ae is studied in dichloromethane under high pressures up to 7 kbar. The kinetics is measured by o