An intramolecular aldol reaction of keto acetals 1, regioselectively
performed with Me3SiI–(Me3Si)2NH
leading to spirobicyclic compounds 2 and 3, has been applied to the
syntheses of (±)-spirojatamol and
(±)-erythrodiene.
FeCl3-Promoted One-Step Synthesis of Spiro[4.5]decane Derivatives
作者:Zhixiang Xie、Ying Li、Deping Zheng、Zuodong Ma、Wanchun Gong
DOI:10.1055/s-0030-1258541
日期:2010.9
A FeCl3-promoted synthesis of spiro[4.5]decane derivatives has been developed from 2-(5,5-dimethoxypentyl)-1-substituted cyclopentanols with high diastereoselectivity. These interesting compounds are formed through a cascade process involving a FeCl3-promoted dehydration of alcohol followed by FeCl3-mediated Prins cyclization.
Facile and Stereoselective Access to Nonracemic Tricyclic Cyclobutanes by Asymmetric Intramolecular Michael−Aldol Reaction: Thermodynamic Equilibrium and Activation by Iodonium Ion
作者:Kiyosei Takasu、Megumi Ueno、Masataka Ihara
DOI:10.1021/jo010207q
日期:2001.6.1
Intramolecular Michael-aldol reactions of (-)-phenylmenthyl enoates tethered to cycloalkanone affords tricyclic cyclobutanes with high degrees of diastereochemical control. Kinetic and thermodynamic studies revealed that the Michael-aldol reaction is reversible under conditions in which trimethylsilyl iodide is used in the presence of hexamethyldisilazane at ambient temperature. Different levels of