An Oxazoline-Mediated Synthesis of the Pyrrolophenanthridine Alkaloids and Some Novel Derivatives
摘要:
An unsymmetrical biaryl coupling between the Grignard of N-benzyl-7-bromoindoline 25 and the appropriately substituted (o-methoxyaryl)oxazoline 15 leads to an intermediate biaryl which can be elaborated in one step to the 1H-pyrrolo[3,2,1-de]phenanthridine ring system. This simple two-step sequence provides general access to the pyrrolophenanthridine alkaloids 2-6.
A total synthesis of the pyrrolophenthridone alkaloid oxoassoanine
摘要:
Coupling of the Grignard derived from N-Benzyl-7-bromoindoline with an aryl oxazoline leads to the title compound in good yield (Scheme 3). This methodology provides a versatile route to the Pyrrolophenthridone class of alkaloids.