Contrasting Regiochemistry in Thermal and Photochemical Allylstannations of 1,2-Naphthoquinone
作者:Yutaka Nishigaichi、Naofumi Yoshida、Mikiya Matsuura、Akio Takuwa
DOI:10.1246/cl.1999.803
日期:1999.8
1,2-Naphthoquinone with γ-substituted allyltin reagents undergoes both thermal and photochemical reactions, which show the opposite regioselectivities to each other. The both reactions are supposed to proceed via the initial 1,2-addition, which occurs at the γ-position of the allyltin in the thermal reaction and at the less hindered α-position in the photoreaction, followed by the [3,3] allylic migration.
1,2-萘醌与γ-取代的烯丙基锡试剂会发生热反应和光化学反应,这两种反应的区域选择性正好相反。这两种反应都是通过最初的 1,2-加成反应进行的,在热反应中,加成反应发生在烯丙基锡的γ 位,而在光反应中,加成反应发生在受阻较小的α 位,随后发生[3,3] 烯丙基迁移。