N-磺酰基-1,2,3-三唑系链的环己二酮的铑催化的分子内脱氮环转移反应已经可以在操作简单的过程中合成苯并呋喃和环丙烷[ cd ]吲哚-甲醛。明显地,反应途径完全取决于存在于环己二酮单元和三唑部分之间的接头杂原子(O或N)。在O-连接的三唑的情况下,发生由分子内环丙烷化和重排组成的级联序列,导致形成苯并呋喃,而在N-连接的三唑的情况下,仅分离出环丙烷[ cd ]吲哚-甲醛。
Catalyst-Controlled Regiodivergent Alkyne Insertion in the Context of C−H Activation and Diels-Alder Reactions: Synthesis of Fused and Bridged Cycles
作者:Xukai Zhou、Yupeng Pan、Xingwei Li
DOI:10.1002/anie.201704036
日期:2017.7.3
Rhodium(III)- and cobalt(III)-catalyzed C−Hactivation of indoles and coupling with 1,6-enynes is discussed. Under rhodium(III) catalysis, the alkyne insertion follows 2,1-regioselectivity with a subsequent type-I intramolecular Diels–Alder reaction (IMDA) to afford [6,5]-fused cycles. When catalyzed by the cobalt(III) congener, 1,2-insertion of the alkyne is preferred, and followed by a rare type-II
Copper-catalyzed asymmetric silylative cyclization of cyclohexadienone-containing 1,6-enynes
作者:Cheng-Yu He、Li-Bo Xie、Rui Ding、Ping Tian、Guo-Qiang Lin
DOI:10.1016/j.tet.2018.12.002
日期:2019.3
The first copper-catalyzed asymmetric silylative cyclization of cyclohexadienone-containing 1,6-enynes has been accomplished through a tandem process: regioselective silylcupration of terminal unactivated alkynes and subsequently enantioselective conjugate addition to cyclohexadienones. This reaction proceeded smoothly to afford the cis-hydrobenzofuran and cis-hydroindole frameworks bearing two consecutive
Efficient Access to Bicyclo[4.3.0]nonanes: Copper‐Catalyzed Asymmetric Silylative Cyclization of Cyclohexadienone‐Tethered Allenes
作者:Zhi‐Tao He、Xiao‐Qi Tang、Li‐Bo Xie、Mian Cheng、Ping Tian、Guo‐Qiang Lin
DOI:10.1002/anie.201508125
日期:2015.12
silylative cyclization of cyclohexadienone‐tethered allenes. Through regioselective β‐silylation of the allene and subsequent enantioselective 1,4‐addition to cyclohexadienone, this tandem reaction could afford cis‐hydrobenzofuran, cis‐hydroindole, and cis‐hydroindene frameworks with excellent yields (80–98 %) and enantioselectivities (94–98 % ee) bearing vinylsilane and enone substructures. Meanwhile,
Rh(III)-Catalyzed Coupling of Acrylic Acids and Ynenones via Olefinic C–H Activation and Michael Addition
作者:Yuqin Jiang、Pengfei Li、Juanjuan Wang、Jie Zhao、Yang Li、Yawen Zhang、Junbiao Chang、Bingxian Liu、Xingwei Li
DOI:10.1021/acs.orglett.9b04191
日期:2020.1.17
Rh(III)-catalyzed coupling between acrylic acids and yndienones has been realized for the synthesis of cis-hydrobenzofuranone. The reaction proceeded in excellent regio- and stereoselectivity under mild and redox-neutral conditions via a sequence of carboxylic acid-directed olefinic C-H activation, alkyne insertion, and Michael addition. Representative products were found to exhibit cytotoxicity toward
Arylation/Intramolecular Conjugate Addition of 1,6-Enynes Enabled by Manganese(I)-Catalyzed C–H Bond Activation
作者:Yun-Xuan Tan、Xing-Yu Liu、Yi-Shuang Zhao、Ping Tian、Guo-Qiang Lin
DOI:10.1021/acs.orglett.8b03288
日期:2019.1.4
established through initiation by manganese(I)-catalyzedC–H bond activation. This tandem reaction involved unusual E/Z-isomerized alkenyl-Mn intermediates and proceeded smoothly with high chemoselectivities and perfect atom economy. The cyclization products could be further transformed to various structures. Mechanistic studies suggested that cleavage of the C–H bond was involved in the turnover-limiting