申请人:North Carolina State University
公开号:US05478943A1
公开(公告)日:1995-12-26
Disclosed are new methods of making camptothecin and camptothecin analogs defined by Formula I: ##STR1## wherein R is loweralkyl; R.sub.1 is H, loweralkyl, loweralkoxy, or halo; and R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each independently H, amino, hydroxy, loweralkyl, loweralkoxy, loweralkylthiol, di(loweralkyl)amino, cyano, methylenedioxy, formyl, nitro, halo, trifluoromethyl, aminomethyl, azido, amido, hydrazino, or any of the twenty standard amino acids bonded to the A ring via the amino-nitrogen atom. The methods comprise cyclizing a compound of Formula IV: ##STR2## wherein X is Br or I, and Y is H, by an Aryl-to-Aryl free radical coupling reaction to yield a compound of Formula I. Compounds of Formula IV are made by alkylating a compound of Formula III: ##STR3## wherein R is loweralkyl and Y is H with a compound of Formula II-x: ##STR4## wherein X is a Br or I and V is hydroxy, by a Mitsunobu reaction to yield the compound of Formula IV.
本发明涉及一种制备喜树碱及其类似物的新方法,其中所述类似物由式I定义:##STR1## 其中,R为低碳基;R1为H、低碳基、低碳氧基或卤素;R2、R3、R4和R5各自独立地为H、氨基、羟基、低碳基、低碳氧基、低碳硫基、二(低碳基)氨基、氰基、亚甲二氧基、甲酰基、硝基、卤素、三氟甲基、氨甲基、叠氮基、酰胺基、肼基或通过氨基氮原子与A环键合的20种标准氨基酸之一。该方法包括通过芳基到芳基自由基耦合反应使式IV的化合物环化:##STR2## 其中,X为Br或I,Y为H,以得到式I的化合物。式IV的化合物通过将式III的化合物:##STR3## 其中,R为低碳基,Y为H,与式II-x的化合物烷基化:##STR4## 其中,X为Br或I,V为羟基,通过Mitsunobu反应得到式IV的化合物。