Attempted intramolecular diets-alder reactions of 2-azadienes: Alternative dimerisation and dipolar cycloaddition pathways
作者:James V. Barkley、Thomas L. Gilchrist、António M.d'A. Rocha Gonsalves、Teresa M.V.D. Pinho e Melo
DOI:10.1016/0040-4020(95)00882-9
日期:1995.11
methyl ester and 2-allyloxybenzaldehyde 1. Compound 5 failed to undergo an intramolecular Diels-Alder reaction. When it was generated in the presence of aluminium trichloride the pyridine 6a was isolated; the structure of this pyridine indicates that the catalyst has reversed the regiochemistry of the dimersiation of 5. The reaction of the activated allyloxybenzaldehyde 2 with cysteine methyl ester follows