The reaction proceeds through the [4+2] annulation step, which is a cycloaddition reaction between the two key intermediates, leading to the formation of the spirocyclic benzopyranone.
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(4E)-4-pentylidene-3-phenylisochroman-1-one
1b
(4E)-4-pentylidene-2-(p-tolyl)-3-(p-tolylimino)-3,4-dihydro-2H-isoquinolin-1-one
2-p-tolyl-2-(trifluoromethyl)-2H-pyran-4(3H)-one
3,4-bis(4-chlorophenyl)-1H-2-benzopyran-1-one
ETHYLIDENECYCLOHEPTANE
