Intramolecular Photocycloaddition of Unsaturated Isoquinuclidines. Synthesis of 2-Azatetracyclo[4.0.0.<sup>4,9</sup>0<sup>7,10</sup>]decanes and 3-Azatetracyclo[6.1.1.0.<sup>2,7</sup>0<sup>5,9</sup>]decanes
作者:Younggi Choi、James D. White
DOI:10.1021/jo0401321
日期:2004.5.1
2-Azabicyclo[2.2.2]oct-5-enes bearing an endo alkenyl substituent were synthesized by Diels−Alder addition of methyl vinyl ketone to a 1,6-dihydropyridine derived from methyl nicotinate. Although 1,5-dienes with this skeleton were unreactive under thermal conditions, they were photochemically reactive. Irradiation of these dienes through a Corex filter resulted in intramolecular [2 + 2] cycloaddition