An efficient synthesis of diversely functionalized furans is developed via Cu-mediated intermolecular annulative couplings of acetylenic sulfones and activated methylenes, which provides a straightforward and atom-economic way to tetrasubstituted furan derivatives in good yields.
A Convenient New Route to Piperidines, Pyrrolizidines, Indolizidines, and Quinolizidines by Cyclization of Acetylenic Sulfones with β- and γ-Chloroamines. Enantioselective Total Synthesis of Indolizidines <b>(</b><b>−</b><b>)-167B</b>, <b>(</b><b>−</b><b>)-209D</b>, <b>(</b><b>−</b><b>)-209B</b>, and <b>(</b><b>−</b><b>)-207A</b>
作者:Thomas G. Back、Katsumasa Nakajima
DOI:10.1021/jo000080p
日期:2000.7.1
the corresponding 2- or 2,6-disubstituted piperidines, while 2-(chloromethyl)pyrrolidines, 2-(2-chloroethyl)pyrrolidines, 2-(chloromethyl)piperidines, and 2-(2-chloroethyl)piperidines produced the corresponding 3-substituted pyrrolizidines, 5- or 3-substituted indolizidines, and 4-substituted quinolizidines, respectively. 8-Methyl-5-substituted indolizidines were also prepared from the appropriate methyl-substituted
Highly Stereoselective Three-Component Reactions of Phenylselenomagnesium Bromide, Acetylenic Sulfones, and Saturated Aldehydes/Ketones or α,β-Unsaturated Enals or Enones
作者:Xian Huang、Meihua Xie
DOI:10.1021/jo026249b
日期:2002.12.1
conjugate-nucleophilic addition of acetylenic sulfones, phenylselenomagnesium bromide, and carbonyl compounds, such as aldehydes, aliphatic ketones, or alpha,beta-unsaturated enals or enones. The reaction is highly regio- and stereoselective with moderate to good yields. Functionalized allylic alcohols were obtained in the case of aldehydes and aliphatic ketones. In the case of alpha,beta-unsaturated enones, functionalized
A facile stereoselective synthesis of (Z)-α-arylsulfonyl-α,β-unsaturated ketones
作者:Shengyong You、Jianying Li、Mingzhong Cai
DOI:10.1016/j.tet.2009.06.072
日期:2009.8
gives highly regio- and stereoselectively (E)-α-stannylvinyl sulfones 2 in high yields. (E)-α-Stannylvinyl sulfones 2 are new difunctional group reagents which undergo Stillecoupling reactions with acyl chlorides 3 to afford stereoselectively (Z)-α-arylsulfonyl-α,β-unsaturatedketones 4 in good yields. A one-pot stereoselectivesynthesis of (Z)-α-arylsulfonyl-α,β-unsaturatedketones 4 has also been achieved
Nickel-catalyzed cross-coupling reaction of acetylenic sulfones with alkynyl Grignard reagents: a facile method for the preparation of unsymmetrical 1,3-diynes
作者:Kuang Fang、Meihua Xie、Zhannan Zhang、Peng Ning、Guanying Shu
DOI:10.1016/j.tetlet.2013.05.049
日期:2013.7
The cross-coupling reaction of acetylenic sulfones with acetylenic Grignardreagents was realized by using Ni(acac)2 as catalyst to afford unsymmetrical 1,3-diynes under mild conditions without homocoupling byproducts. By using this method, 1,4-diaryl-1,3-diynes could be obtained in moderate to good yields (59–83%), whereas, the yields for alkyl substituted 1,3-diynes are lower (30–54%).