Synthetic approaches towards the synthesis of the pyrrole oxazole skeleton of
phorbazoles A–D are described. An efficient synthesis of the pyrrole
oxazole skeleton (19) from pyrrole and 4- methoxyacetophenone was developed.
In the key step, cyclodehydration of the amide (16) resulted in formation of
the diprotected pyrrole oxazole (17). Subsequent deprotection of the
diprotected pyrrole oxazole (17) gave the target phorbazole skeleton (19).
介绍了用于合成吡咯噁唑骨架的
介绍了用于合成酞咔唑 A-D 的吡咯噁唑骨架的合成方法。以吡咯和 4-甲氧基苯乙酮为原料,高效合成了吡咯
恶唑骨架 (19) 的高效合成方法。
在关键步骤中,通过酰胺(16)的环脱水反应形成了
二保护的吡咯噁唑 (17)。随后对
二保护的吡咯噁唑(17)进行脱保护,得到目标的酞唑骨架(19)。