The laccase catalyzed oxidative dimerization of salicylic esters, a rare example of a laccase-catalyzed carbon–carbon bond formation, was studied. This reaction allows the use of air as stoichiometric oxidant and proceeds in aqueous solution. The preparative scope and the mechanism of the method, which provides a new and convenient access to functionalized biaryls under mild conditions, were investigated
Domino “[3+3]-Cyclization-Homo-Michael” Reactions of 1,3-Bissilyl Enol Ethers with 1,1-Diacylcyclopropanes
作者:Gopal Bose、Van Thi Hong Nguyen、Ehsan Ullah、Sunanda Lahiri、Helmar Görls、Peter Langer
DOI:10.1021/jo0485278
日期:2004.12.1
The Lewis acid mediated domino " [3+3] -cyclization-homo-Michael" reaction of 1,3-bissilyl enol ethers with 1,1-diacylcyclopropanes allows an efficient one-pot synthesis of functionalized salicylates containing a halogenated side chain. A great variety of substitution patterns could be realized by variation of the starting materials and of the Lewis acid. The mechanism of the domino process was studied.
Synthesis of dibenzo[b,d]pyran-6-ones based on a ‘[3+3] cyclization–Suzuki cross-coupling’ strategy
作者:Van Thi Hong Nguyen、Peter Langer
DOI:10.1016/j.tetlet.2004.12.030
日期:2005.2
Functionalized dibenzo[b,d]pyran-6-ones were prepared by sequential '[3+3] cyclization-Suzuki cross-coupling' reactions. (C) 2004 Elsevier Ltd. All rights reserved.
[3+3] Cyclizations of 1,3-Bis(silyl enol ether)s with 1,1-Diacetylcyclopentane and 1,1-Diacetylcyclopropane