Chiral Lewis acids supported on silica gel and alumina, and their use as catalysts in Diels-Alder reactions of methacrolein and bromoacrolein

Article abstract of DOI:10.1016/0957-4166(96)00281-9

Several derivatives of (S)-tyrosine are supported on silica gel through the phenolic oxygen atom. The Lewis acids obtained by treatment of these solids with BH₃ are able to promote the reactions of methacrolein and bromoacrolein with cyclopenta