The photochemical[2 + 2]cycloaddition to N-methoxycarbonyl-5,6-dihydro-4-pyridone
Abstract
The N-methoxycarbonyl-5,6-dihydro-4-pyridone (1) undergoes photochemical [2 + 2] cycloaddition with a series of differently substituted alkenes in high yield and with extremely high regioselectivity.