Facile reductive oxy-Nazarov cyclization of 2-methoxy-2, 4-hexadienoates

Abstract Reduction of 2-methoxy-2, 4-hexadienoates with Dibal-H in toluene at −78 °C resulted in a facile formation of 5-hydroxyl cyclopentenone derivatives. This novel transformation was proposed as a variant of the oxy-Nazarov cyclization of the corresponding 2-methoxy aldehyde intermediate via the cationic Al-chelate as depicted in Fig. 2a.