... Volume: Page: ... 18 The only prior report of a [π6s+π4s] cycloaddition with a 2-azaallyllithium species is the reaction of the Kauffmann-type 2 ... of cycloheptatriene afforded the [π6s+π4s] adducts 30 and 31 and [π4s+π2s] adduct 32 in good yield (78% yield, 11:1:3 ...