New Cross Aldol Reactions. Titanium Tetrachloride-promoted Reactions of Silyl Enol Ethers with Carbonyl Compounds Containing A Functional Group
作者:Kazuo Banno
DOI:10.1246/bcsj.49.2284
日期:1976.8
It was found that, in the presence of titanium tetrachloride, silylenolethersselectively react with aldehyde or ketone function of various carbonyl compounds containing another functional group giving the corresponding cross aldols in good yields. The present cross aldol reaction was successfully applied to the synthesis of arturmerone, one of the volatile principles of turmeric oil.
NEW CROSS ALDOL REACTIONS. THE REACTIONS OF SILYL ENOL ETHERS WITH KETO ESTERS PROMOTED BY TITANIUM TETRACHLORIDE
作者:Kazuo Banno、Teruaki Mukaiyama
DOI:10.1246/cl.1975.741
日期:1975.7.5
It was found that, in the presence of TiCl4, keto esters such as ethyl pyruvate, ethyl 2,2-dimethyl acetoacetate, ethyl levulinate and ethyl 5-oxohexanoate react with various trimethylsilyl enol ethersderivedfromketones at room temperature to afford cross aldols, i.e., hydroxy keto esters, in good yields.
TiCl<sub>4</sub>-<i>n</i>-Bu<sub>3</sub>N-mediated cascade annulation of ketones with α-ketoesters: a facile synthesis of highly substituted fused γ-alkylidene-butenolides
作者:Megha N. Palange、Rajesh G. Gonnade、Ravindar Kontham
DOI:10.1039/c9ob00649d
日期:——
to biologically relevant natural products were prepared from readily accessible ketone and α-ketoester building blocks. The highly step-economic cascade nature, good substrate scope, easy access to complex products with good to excellent yields, gram-scalability, demonstration of synthetic utility, and unambiguous structuralconfirmation through X-ray crystallography analyses and analogy are the salient