of a stable aromatic dilithium compound. The adducts of the latter with CO2, aldehydes or ketones undergo ring closure to isochroman derivatives, leading to ring expansion of the original heterocycle. The reductive electrophilic substitution procedure was successfully extended to the substituted phthalans 1b and 1c, to afford the corresponding isochroman-3ones in satisfactory yields.
在催化量的
萘的存在下,
邻苯二甲酸1a与
锂金属的还原裂解导致形成稳定的芳族二
锂化合物。后者与CO 2,醛或酮的加成物闭环成
异色满衍
生物,导致原始杂环的扩环。还原亲电取代程序已成功地扩展到取代的
酞菁1b和1c,以令人满意的产率提供了相应的
异色满-3one。