Arylcyclopropane photochemistry. Unusual aromatic substituent effects on the photochemical rearrangement of (2-arylcyclopropyl)methyl acetates to 1-arylhomoallyl acetates
Scandium Triflate Catalyzed Allylation of Acetals and <i>gem</i>-Diacetates: A Facile Synthesis of Homoallyl Ethers and Acetates
作者:Jhillu S. Yadav、Basi V. Subba Reddy、P. Srihari
DOI:10.1055/s-2001-13379
日期:——
Scandium triflate catalyzes efficiently the allylation reactions of acetals and gem-diacetates with allyltrimethylsilane at ambient temperature to afford the corresponding homoallyl ethers and acetates in high yields. Also it is found to be effective for the direct formation of homoallyl ethers from aldehydes and allylsilane in presence of trimethylorthoformate.
Indium-mediated one-pot, three-component synthesis of homoallyl alcohol esters without catalysts and dehydrants
作者:Zhengyin Du、Yanchun Li、Fen Wang、Wanwei Zhou、Jin-Xian Wang
DOI:10.1016/j.tetlet.2010.01.092
日期:2010.3
Indium-mediated one-pot esterification reaction of acyl chlorides or anhydride by using in situ-prepared homoallylalcohols from aromatic aldehydes and allyl bromide proceeded smoothly to afford the corresponding homoallylalcohol esters in high yields within about 1 h, which provided a simple and efficient protocol for the simultaneous allylation and esterification of aldehydes without other catalysts and dehydrants
Bismuth Compounds in Organic Synthesis. A One-Pot Synthesis of Homoallyl Ethers and Homoallyl Acetates from Aldehydes Catalyzed by Bismuth Triflate
作者:Peter W. Anzalone、Ashvin R. Baru、Eric M. Danielson、Patrick D. Hayes、Mai P. Nguyen、Ambrose F. Panico、Russell C. Smith、Ram S. Mohan
DOI:10.1021/jo048475m
日期:2005.3.1
[GRAPHICS]Three one-pot methods for the conversion of aldehydes to homoallyl ethers catalyzed by Bi(OTf)(3)center dot xH(2)O (1 < x < 4) have been developed. The one-pot synthesis of homoallyl ethers can be achieved either by in situ generation of the acetal followed by its reaction with allyltrialkylsilane or by a three-component synthesis in which the aldehyde, trimethylorthoformate or an alkoxytrimethylsilane and allyltrimethylsilane are mixed together in the presence of bismuth triflate (0.1-1.0 mol %). In addition, a three-component synthesis of homoallyl acetates, which is achieved by reacting the aldehyde, acetic anhydride, and allyltrimethylsilane in the presence of bismuth triflate (3.0-5.0 mol %), has been developed. The use of a relatively nontoxic, easy to handle, and inexpensive catalyst adds to the versatility of these methods.
Sc(OTf)3, an Efficient Catalyst for Addition of Allyltrimethylsilane to Aldehydes; Chemoselective Addition to Aldehydes in Presence of Ketones and in situ Acylation (3 Component Coupling)