我们报道了一种合成N-保护的星形孢菌素的方法,该方法可用于合成吲哚[2,3- a ]吡咯并[3,4- c ]咔唑生物碱和相关化合物。在叔丁基锂存在下,禾本科甲硫氨酸(2)与3-(N-苄基)吲哚基乙腈(3)相互作用,然后经CF 3 COOH催化的分子内吲哚-吲哚偶联和DDQ脱氢,生成5-氰基吲哚[2,3- a ]咔唑6几乎是定量的。还原其氰基,然后进行N-苄基化生成N-苄基氨基甲基吲哚[2,3- a ]咔唑8b,使其经受Pd(OAc)2催化的直接芳族羰基化反应,得到N-保护的星形孢菌酮9b。用在苯甲醚中的AlCl 3处理除去N-苄基,定量得到星形孢菌素。
Palladium-Catalyzed Cross-Coupling Reactions of Potassium N-Methyltrifluoroborate Isoindolin-1-one with Aryl and Heteroaryl Chlorides
作者:Rashid N. Nadaf、Dave G. Seapy
DOI:10.1080/00397911.2014.884591
日期:2014.7.18
Abstract Potassium N-methyltrifluoroborate isoindolin-1-one was synthesized and used in Suzuki–Miyaura palladium-catalyzed cross-coupling reactions with aryl and heteroaryl chlorides to prepare 29 examples of substituted N-benzyl isoindolin-1-ones. The new approach benefits from mild reaction conditions that tolerate a variety of functional groups. In addition, because of the large number of commercially
for the synthesis of N-protected staurosporinones, which are useful for the synthesis of indolo[2,3-a]pyrrolo[3,4-c]carbazole alkaloids and related compounds. An interaction of gramine methiodide (2) with 3-(N-benzyl)indolylacetonitrile (3) in the presence of t-BuLi, followed by a CF3COOH-catalyzed intramolecular indole−indole coupling and dehydrogenation with DDQ, produced 5-cyanoindolo[2,3-a]carbazole
我们报道了一种合成N-保护的星形孢菌素的方法,该方法可用于合成吲哚[2,3- a ]吡咯并[3,4- c ]咔唑生物碱和相关化合物。在叔丁基锂存在下,禾本科甲硫氨酸(2)与3-(N-苄基)吲哚基乙腈(3)相互作用,然后经CF 3 COOH催化的分子内吲哚-吲哚偶联和DDQ脱氢,生成5-氰基吲哚[2,3- a ]咔唑6几乎是定量的。还原其氰基,然后进行N-苄基化生成N-苄基氨基甲基吲哚[2,3- a ]咔唑8b,使其经受Pd(OAc)2催化的直接芳族羰基化反应,得到N-保护的星形孢菌酮9b。用在苯甲醚中的AlCl 3处理除去N-苄基,定量得到星形孢菌素。