One-pot synthesis of pyridines from 3-aza-1,5-enynes
摘要:
Efficient one-pot transformation of 3-aza-1,5-enynes to poly-substituted pyridines in good to excellent yields has been developed. This reaction involved cyclization of 3-aza-enynes and elimination of sulfinyl acids steps. (C) 2013 Elsevier Ltd. All rights reserved.
Highly Regioselective Migration of the Sulfonyl Group: Easy Access to Functionalized Pyrroles
作者:Xiaoyi Xin、Dongping Wang、Xincheng Li、Boshun Wan
DOI:10.1002/anie.201108144
日期:2012.2.13
Good migrations: The highlyregioselectivemigration of a sulfonylgroup for the synthesis of functionalizedpyrroles is reported (see scheme; DMF=N,N‐dimethylformamide). The migration of the sulfonylgroup to different positions can be controlled with high selectivity, thus allowing the formation of both α‐ and β‐(arylsulfonyl)methyl pyrroles with high yields.
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。
Cyclization and <i>N</i>-Iodosuccinimide-Induced Electrophilic Iodocyclization of 3-Aza-1,5-enynes To Synthesize 1,2-Dihydropyridines and 3-Iodo-1,2-dihydropyridines
作者:Xiaoyi Xin、Dongping Wang、Fan Wu、Xincheng Li、Boshun Wan
DOI:10.1021/jo400387b
日期:2013.4.19
Metal-free cyclization and N-iodosuccinimide-induced electrophilic iodocyclization of readily available 3-aza-1,5-enynes have been developed. The reactions selectively give 1,2-dihydropyridines and 3-iodo-1,2-dihydropyridines involving an aza-Claisen rearrangement and a 6p-electrocyclization step. Furthermore, the reaction could be carried out in 10 g scale for the synthesis of 1,2-dihydropyridines.