Synthesis of Polyfluoroalkyl Cyclobutenes from 3-Aza-1,5-enynes via an Aza-Claisen Rearrangement/Cyclization Cascade
作者:Xiaoyi Xin、Dongping Wang、Fan Wu、Chunxiang Wang、Haolong Wang、Xincheng Li、Boshun Wan
DOI:10.1021/ol4020738
日期:2013.9.6
A facile synthetic route to access polyfluoroalkyl functionalized cyclobutenes bearing an exo cyclic double bond from 3-aza-1,5-enynes is reported. The reaction proceeds via a thermal aza-Claisen rearrangement to give an allene-imine intermediate; subsequent cyclization affords the cyclobutene core. The kinetics of the transformation of starting material and the intermediate was studied by 1H NMR spectroscopy
报道了一种容易的合成路线,该路线可从3-氮杂-1,5-烯炔中获得带有外环双键的多氟烷基官能化的环丁烯。反应通过热氮杂-克莱森重排进行,得到烯丙基-亚胺中间体;随后环化得到环丁烯核。通过1 H NMR光谱研究了起始原料和中间体的转化动力学,其中揭示了连续的反应。
Selective synthesis of functionalized pyrroles from 3-aza-1,5-enynes
作者:Yingying Zhao、Haolong Wang、Xincheng Li、Dongping Wang、Xiaoyi Xin、Boshun Wan
DOI:10.1039/c5ob01887k
日期:——
2-Trifluoromethyl-5-(arylsulfonyl)methyl pyrroles and 2-trifluoromethyl-4-(arylsulfonyl)methyl pyrroles were selectively synthesized from trifluoromethyl-substituted 3-aza-1,5-enynes via a cyclization/sulfonyl group migration cascade catalyzed by AgOOCCF3 and CsOPiv, respectively. Alkylvinyl-substituted pyrroles were generated from seven-atom skeleton 3-aza-1,5-enynes via aryl sulfinic acid elimination
由三氟甲基取代的3-氮杂-1,5-烯炔经AgOOCCF催化的环化/磺酰基迁移级联反应选择性地合成了2-三氟甲基-5-(芳基磺酰基)甲基吡咯和2-三氟甲基-4-(芳基磺酰基)甲基吡咯3和CsOPiv。在Cs 2 CO 3存在下,通过芳基亚磺酸的消除,由七个原子的3-氮杂-1,5-烯炔骨架生成烷基乙烯基取代的吡咯。提出了两种离子对中间体,并在机理研究中成功分离出关键中间体氮杂-二烯-炔。
Dimethylzinc-Mediated Alkynylation of Imines
作者:Lorenzo Zani、Silvia Alesi、Pier Giorgio Cozzi、Carsten Bolm
DOI:10.1021/jo052273o
日期:2006.2.1
[GRAPHICS]The treatment of various aromatic and aliphatic aldimines with a mixture of a terminal alkyne and a commercially available dimethylzinc solution in toluene yields the corresponding protected propargylic amines in moderate to excellent yields. The reaction proceeds in the absence of any activator. These observations led to the development of a three-component synthesis of propargylic amines in which the product was obtained upon mixing an aldehyde with ortho-methoxyaniline and phenylacetylene in the presence of dimethylzinc, through in situ formation of the corresponding imine.
Alkynylation of N-tosylimines with aryl acetylenes promoted by ZnBr2 and N,N-diisopropylethylamine in acetonitrile
作者:Ka Young Lee、Chang Gon Lee、Jeong Eun Na、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2004.11.046
日期:2005.1
We found a suitable condition for the effective alkynylation of N-tosylimines with aryl acetylenes. The reaction tosylimines and aryl acetylenes in the presence of ZnBr2, and DIEA (N,N -diisopropylethylamine) in CH3CN afforded the desired N-tosyl propargylamines in moderate to good yields. (C) 2004 Elsevier Ltd. All rights reserved.
Generation of Indeno[1,2-<i>c</i>]pyrroles via a Pd-Catalyzed Reaction of 2-Alkynylbromobenzene with Propargylic Sulfonamide
作者:Yong Luo、Jie Wu
DOI:10.1021/ol300334h
日期:2012.3.16
A novel route for the efficient assembly of indeno[1,2-c]pyrrole derivatives via a palladium-catalyzed tandem reaction of 2-alkynylbromobenzene with propargylic sulfonamide is reported. The starting materials are easily available, and the reaction proceeds smoothly with good functional group tolerance.