title: Acid-free aza Diels-Alder reaction of Danishefsky's diene with imines.
abstract: [reaction: see text] A highly efficient aza Diels-Alder reaction of Danishefsky's diene with imines was found to occur in methanol in the absence of any acids at room temperature to give corresponding 2-substituted dihydro-4-pyridone derivatives in high yields. This reaction can be also carried out in a three-component one-pot reaction manner. The reaction was found to proceed through a Mannich-type condensation mechanism.
authors.affiliation: State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, P R China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Yuan
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Kuiling
authors.initials: K
authors.lastname: Ding