Vinyldichloroboranes react with 1,3-dienes and the sequence Diels–Alder cycloaddition–reductive alkylation of benzyl azide leads directly to secondary amines, therefore, showing that vinyldichloroboranes behave as synthetic equivalents of secondary enamines of defined stereochemistry.
A facile microwave-assisted Diels–Alder reaction of vinylboronates
作者:Ariel M. Sarotti、Pablo L. Pisano、Silvina C. Pellegrinet
DOI:10.1039/c0ob00020e
日期:——
The DielsâAlder reaction of vinylboronates can be easily performed using microwave irradiation giving excellent yields of the cycloadducts. Pinacol vinylboronate was the reagent of choice due to its stability towards hydrolysis, operational simplicity and yields of DielsâAlder products. To the best of our knowledge, this is the first example of microwave-assisted DielsâAlder reaction of boron-substituted dienophiles. Subsequent in situ oxidation of the cycloadducts with alkaline hydrogen peroxide afforded the alcohols efficiently.