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.