An Expeditious Nazarov Cyclization Strategy toward the Hydroazulene Core of Guanacastepene A
摘要:
The hydroazulene core of guanacastepene A has been synthesized in five steps from commercially available starting materials using a classical Nazarov cyclization to install the stereochemistry in the cyclopentanone diastereoselectively. In the presence or absence of Lewis bases, a hydroazulenone or a spirocyclic ketone generated via a novel Wagner-Meerwein rearrangement is obtained with excellent selectivity and yield.
Synthesis of the guanacastepene A–B hydrazulene ring system through photochemical ring transposition
作者:Craig A. McGowan、Ann-Kathrin Schmieder、Lee Roberts、Michael F. Greaney
DOI:10.1039/b704865c
日期:——
The AâB hydrazulene ring system of the guanacastepenes has been synthesised using a photochemical ring transposition of a 6â6 bicycle.
已通过光化学环转位反应合成了广阔松烃的A–B肼阿烯环系统,该反应使用了6–6双环。
An Expeditious Nazarov Cyclization Strategy toward the Hydroazulene Core of Guanacastepene A
作者:Pauline Chiu、Shuoliang Li
DOI:10.1021/ol036433z
日期:2004.2.1
The hydroazulene core of guanacastepene A has been synthesized in five steps from commercially available starting materials using a classical Nazarov cyclization to install the stereochemistry in the cyclopentanone diastereoselectively. In the presence or absence of Lewis bases, a hydroazulenone or a spirocyclic ketone generated via a novel Wagner-Meerwein rearrangement is obtained with excellent selectivity and yield.