A concise synthesis of carpanone using solid-supported reagents and scavengers
作者:Ian R. Baxendale、Ai-Lan Lee、Steven V. Ley
DOI:10.1039/b203388g
日期:2002.8.8
Polymer-supported reagents have been applied to the synthesis of the natural product carpanone resulting in a clean and efficient synthesis without the requirement for conventional purification techniques. A new polymer-supported transition metal isomerisation catalyst is also reported.
Catalytic Asymmetric Claisen Rearrangement of Unactivated Allyl Vinyl Ethers
作者:Maryll E. Geherty、Robert D. Dura、Scott G. Nelson
DOI:10.1021/ja1039314
日期:2010.9.1
original discovery, catalyzed enantioselective variants of the venerable Claisenrearrangement remain relatively rare. We have discovered a cooperative transition metal-Lewis acid cocatalyst system that affects highly enantio- and diastereoselective examples of archetypical Claisenrearrangements. The catalyzed rearrangements proceed using an easily prepared enantioenriched transition metal catalyst
Stereoselective Isomerization of Unsymmetrical Diallyl Ethers to Allyl (<i>E</i>)-Vinyl Ethers by a Cationic Iridium Catalyst
作者:Yasunori Yamamoto、Ryou Fujikawa、Norio Miyaura
DOI:10.1080/00397910008086880
日期:2000.7
The stereoselective isomerization of unsymmetrical diallyl ethers to allyl (E)-vinyl ethers was carried out in the presence of a cationic iridium(I) catalyst. The catalyst prepared in situ by treating [Ir(cod)(PPh2Me)(2)]PF6 with hydrogen was found to be an excellent catalyst to selectively isomerize the less substituted allyl group to an (E)-vinyl ether.