A Friedel-Crafts cyclization approach toward cephalotaxine
摘要:
The 1-azaspiro[4.4]nonane portion 11 of cephalotaxine was prepared via an intramolecular S(N)2' substitution reaction followed by ozonolysis; condensation of 11 with the aromatic portion 13 gave compound 15; a Friedel-Crafts cyclization of 15 in polyphosphoric acid smoothly afforded the cephalotaxine skeleton 16. A single-crystal X-ray analysis of the HCl salt of 16 confirmed the structure of 16.
[EN] PYRIMIDINE-FUSED CYCLIC COMPOUND, PREPARATION METHOD THEREFOR AND USE THEREOF<br/>[FR] COMPOSÉ CYCLIQUE FUSIONNÉ À UNE PYRIMIDINE, PROCÉDÉ DE PRÉPARATION S'Y RAPPORTANT ET SON UTILISATION<br/>[ZH] 嘧啶并环类化合物及其制法和用途
[EN] PYRIMIDINE-FUSED CYCLIC COMPOUND AND PREPARATION METHOD AND USE THEREOF<br/>[FR] COMPOSÉ CYCLIQUE FUSIONNÉ À UNE PYRIMIDINE, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION<br/>[ZH] 嘧啶并环类化合物及其制法和用途