Formal [6+3] cycloaddition of fulvenes with 2H-azirine: A facile approach to the [2]pyrindines system

Article abstract of DOI:10.1016/j.tetlet.2003.12.105

2H-Azirine reacts with fulvenes to give either alkylated fulvene azirines (ultrasound) or the formal [6+3] cycloaddition adducts (Lewis acid). The later constitutes an efficient and novel route to [2]pyrindines.