| Microwave assisted synthesis is affecting the field of organic chemistry greatly. Reactions under the microwaves tend to go faster. The reactions are fast and high yielding, and do not need of supporting solvents. Microwave assisted reactions are increasing exponentially and it being used in industry, and academic labs. In this instance, there is a focus on the Diels-Alder (DA) reactions under microwaves as this reaction is a thermal reaction and is a good candidate for study under microwaves.; This work presents microwave assisted DA reactions of the dienes, 2,5-dimethylfuran and 2,4,5-trimethyloxazole, 2-trimethylsilyloxy1,3-cyclohexadienes and 2-butyl-1,3-cyclohexadienes with acetylenic and olefinic dienophiles. Microwave assisted reactions were run from 2 to 20 minutes. The DA reactions of the dienes with acetylenic dienophile resulted in the formation of the cycloadduct as an intermediate that proceeded via the retro DA reaction to give substituted furan, pyridine and substituted benzene in good yields 60--90%. (Abstract shortened by UMI.)... |
