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A) Proposed mechanism of 6π heterocyclization of 1 b to form 35. B) M06‐2X/def2‐TZVP+SMD(EtOAc)//M06‐2X/def2‐TZVP computed Gibbs energy profile (kcal mol−1) for the cyclization of 1 b to form 35 taking place on singlet and triplet surfaces. ISC=intersystem crossing; TET=triplet energy transfer; MECP=minimum energy crossing point; dis=disrotatory; con=conrotatory.
