Lewis Acid Promoted Hetero [2 + 2] Cycloaddition Reactions of Aldehydes with 10-Propynyl-9(10<i>H</i>)-acridone. A Highly Stereoselective Synthesis of Acrylic Acid Derivatives and 1,3-Dienes Using an Electron Deficient Variant of Ynamine
作者:Richard P. Hsung、Craig A. Zificsak、Lin-Li Wei、Christopher J. Douglas、Hui Xiong、Jason A. Mulder
DOI:10.1021/ol990211c
日期:1999.10.1
[GRAPHICS]Reactivities of 10 propynyl-9(10H)-acridone toward various aldehydes in BF3. Et2O-promoted hetero [2 + 2] cycloaddition reactions are described here. This electron deficient variant of ynamine is more stable and easier to handle than most ynamines but possesses comparable reactivity. These reactions lead to a highly stereoselective synthesis of trisubstituted alkenes. A mechanistic model based on the stereochemical assignment is also described here, 10-Propynyl-9(10H)-acridone is also reactive toward ag-unsaturated aldehydes and ketones. It provides hetero [2 + 2] products in reactions with alpha,beta-unsaturated aldehydes but gives only the inverse demand [4 + 2] cycloadduct in a reaction with methyl vinyl ketone.
Reisch, Johannes; Salehi-Artimani, Reza A., Journal of Heterocyclic Chemistry, 1989, vol. 26, p. 1803 - 1806
作者:Reisch, Johannes、Salehi-Artimani, Reza A.
DOI:——
日期:——
REISCH, JOHANNES;SALEHI-ARTIMANI, REZA A., J. HETEROCYCL. CHEM., 26,(1989) N, C. 1803-1806
作者:REISCH, JOHANNES、SALEHI-ARTIMANI, REZA A.
DOI:——
日期:——
RADL, STANISLAV;KOVAROVA, LENKA;HOLUBEK, JIRI, COLLECT. CZECHOSL. CHEM. COMMUN., 56,(1991) N, C. 439-448
作者:RADL, STANISLAV、KOVAROVA, LENKA、HOLUBEK, JIRI
DOI:——
日期:——
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