柠檬醛
试剂
化学
乙醚
有机化学
缩醛
酚类
肉桂醛
吡啶
催化作用
色谱法
精油
作者
Wickramasinghe M. Bandaranayake,Leslie Crombie,Donald A. Whiting
出处
期刊:Journal of the Chemical Society. C.Organic
[The Royal Society of Chemistry]
日期:1971-01-01
卷期号:: 811-811
被引量:18
摘要
Like citral, 3-methylbut-2-enal condenses under pyridine catalysis with suitable meta-dihydric phenols to give chromens having the 2,2-dimethyl-substitution pattern common in Nature. Citral acetal and 3-methyl-1,1-dimethoxybut-2-ene can replace the free aldehydes, and this observation has led to the development of 3-hydroxy-3-methyl-1,1-dimethoxybutane as a stable and readily accessible dimethylchromenylation reagent. Synthesis of various dimethylchromens, among them lonchocarpin, jacareubin, and evodionol methyl ether, illustrate its use. But-2-enal and cinnamaldehyde may be used in chromenylation reactions.
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