Development of a strategy for synthesis of the unusual marine alkaloid sarain A
摘要:
An 11-step approach to tricyclic compound 42, which contains the alkaloidal nucleus of the marine natural product sarain A (1), has been developed. Pivotal steps in the construction of 42 include stereospecific intramolecular dipolar [3 + 2]-cycloaddition of an azomethine ylide generated from aziridine 27 to afford bicyclic lactam 28 and a novel intramolecular allylsilane/N-tosyliminium ion cyclication of 41 to produce the tricycle.
Development of a strategy for synthesis of the unusual marine alkaloid sarain A
摘要:
An 11-step approach to tricyclic compound 42, which contains the alkaloidal nucleus of the marine natural product sarain A (1), has been developed. Pivotal steps in the construction of 42 include stereospecific intramolecular dipolar [3 + 2]-cycloaddition of an azomethine ylide generated from aziridine 27 to afford bicyclic lactam 28 and a novel intramolecular allylsilane/N-tosyliminium ion cyclication of 41 to produce the tricycle.
Construction of the tricyclic core of the marine alkaloid sarain A
作者:Joseph Sisko、Steven M. Weinreb
DOI:10.1021/jo00010a006
日期:1991.5
The alkaloidal nucleus of sarain A (1) has been synthesized by a short route involving a [3 + 2] azomethine ylide cycloaddition and an allysilane/N-sulfonyliminium ion cyclization as key steps.