Highly Stereoselective Synthesis of Trisubstituted Vinylcyclopropane Derivatives via Arsonium Ylides
作者:Hong Jiang、Xianming Deng、Xiuli Sun、Yong Tang、Li-Xin Dai
DOI:10.1021/jo051782n
日期:2005.11.1
Alkylidene or arylidene malonates reacted with arsonium allylides to give trans-disubstituted cyclopropane-1,1-dicarboxylates with high stereoselectivity in high yields. The mechanism of the cyclopropanation reactions has also been investigated.
A General Method for the Rapid High Yield Preparation of Pure Arsonium Salts. Preparation Of (3-Alkoxy-Carbonyl-2-Oxopropyl)Triphenylarsonium Bromides
作者:Cornelis M. Moorhoff
DOI:10.1080/00397919808004872
日期:1998.8
Abstract An easy, rapid method for the preparation of arsonium salts of high yield and purity, by heating an alkyl halide and triphenylarsine as a melt at about 80°C, is described.
Highly stereoselective synthesis of trans-4-trifluoromethylsulfonyl-2,3-dihydrofurans from arsonium ylides and (E)-α-trifluoromethylsulfonyl-α,β-unsaturated ketones
作者:Zhenqi Chen、Jiaping Zhang、Jie Chen、Hongmei Deng、Min Shao、Hui Zhang、Weiguo Cao
DOI:10.1016/j.tet.2010.05.097
日期:2010.8
The reactions of arsonium bromides with (E)-α-trifluoromethylsulfonyl-α,β-unsaturated ketones in the presence of Cs2CO3 or K2CO3 proceeded smoothly under refluxing condition in dichloromethane (DCM) to give the corresponding trifluoromethylated trans-2,3-dihydrofurans in good to excellent yields with high stereoselectivity.
在二氯甲烷(DCM)中,在回流条件下,在Cs 2 CO 3或K 2 CO 3存在下,溴化砷鎓与(E)-α-三氟甲基磺酰基-α,β-不饱和酮的反应平稳进行,得到相应的三氟甲基化反式- 2,3-二氢呋喃具有良好的收率和优异的立体选择性。
New Liquid Crystalline Stilbene Derivatives Containing 1,2-Dienylalkoxy Chains
作者:Giuseppe Chidichimo、Giovanni De Filpo、Giuseppe Salerno、Lucia Veltri、Bartolo Gabriele、Fiore Pasquale Nicoletta
DOI:10.1080/15421400701205784
日期:2007.3.26
New liquid crystalline stilbene derivatives containing 1,2-dienylalkoxy chains 1 (n = 7, 9, 11) have been synthesized and their mesomorphic properties have been measured by polarizing optical microscopy, differential scanning calorimetry, and absorption spectroscopy. The effect of terminal alkoxy chain length and polimerisable function on the mesomorphic behaviour is discussed.