Synthesis of Phenanthridine Derivatives by Microwave-Mediated Cyclization of o-Furyl(allylamino)arenes
摘要:
A novel and efficient synthesis of phenanthridines and aza analogues is reported. The key step is a microwave-mediated intramolecular Diels-Alder cyclization of o-furyl(allylamino)arenes. In the presence of a catalytic amount of acid, the DA-adduct reacts further to give the dihydrophenanthridines, which easily can be oxidized to fully aromatic compounds by air in the presence of UV light or by DDQ.
Synthesis of Phenanthridine Derivatives by Microwave-Mediated Cyclization of o-Furyl(allylamino)arenes
摘要:
A novel and efficient synthesis of phenanthridines and aza analogues is reported. The key step is a microwave-mediated intramolecular Diels-Alder cyclization of o-furyl(allylamino)arenes. In the presence of a catalytic amount of acid, the DA-adduct reacts further to give the dihydrophenanthridines, which easily can be oxidized to fully aromatic compounds by air in the presence of UV light or by DDQ.
8‐Hydroxyphenathridines have been synthesized from N‐propargyl‐ortho‐furylanilines by a one‐pot intramolecular Diels–Alder reaction on furans (IMDAF) reaction and aromatization. N‐Propargyl‐7‐furylindol(in)es also underwent IMDAF cyclization to give (4,5‐dihydro)7H‐pyrrolo[3,2,1‐de]phenanthridin‐9‐ols These are structurally closely related to bioactive lycorine alkaloids.
通过一锅内呋喃分子内Diels-Alder反应(IMDAF)和芳构化反应,由N-炔丙基-邻-呋喃基苯胺合成了8-羟基苯并吡啶。N-炔丙基-7-呋喃啉(in)也经历了IMDAF环化反应,得到(4,5-二氢)7 H-吡咯并[3,2,1- de ]菲啶-9-醇这些在结构上与生物活性的赖氨酸密切相关生物碱。