Rhodium(<scp>iii</scp>)-catalyzed [5+1] annulation of 2-alkenylphenols with maleimides: access to highly functionalized spirocyclic skeletons
作者:Anil Kumar、Kandikere Ramaiah Prabhu
DOI:10.1039/d1cc01758f
日期:——
A new edition of [5+1] annulation reaction of maleimides with 2-alkenylphenols has been discovered under a Rh(III)-catalytic system. The process leads to an efficient synthesis of valued spirocyclic scaffolds bearing an oxygen-containing spiro carbon in a single step and shows a broad substrate scope with good functional group tolerance. The synthetic utility has been exemplified by synthesizing highly
在Rh( III )-催化体系下发现了马来酰亚胺与2-烯基苯酚的[5+1]环化反应的新版本。该过程导致在单个步骤中有效合成带有含氧螺碳的有价值的螺环支架,并显示出具有良好官能团耐受性的广泛底物范围。合成效用已通过合成高度官能化的 2,2-二取代-2 H-色烯骨架和低催化剂负载的克级合成来举例说明。
OH-Directed Alkynylation of 2-Vinylphenols with Ethynyl Benziodoxolones: A Fast Access to Terminal 1,3-Enynes
作者:Peter Finkbeiner、Ulrich Kloeckner、Boris J. Nachtsheim
DOI:10.1002/anie.201412148
日期:2015.4.13
The first direct alkynylation of 2‐vinylphenols was developed. The rationally optimized hypervalent iodine reagent TIPS‐EBX* in combination with [(Cp*RhCl2)2] as a CH‐activating transition metal catalyst enables the construction of a variety of highly substituted 1,3‐enynes in high yields of up to 98 %. This novel CH activation method shows excellent chemoselectivity and exclusive (Z)‐stereoselectivity
Organocatalytic Asymmetric Synthesis of 1,1-Diarylethanes by Transfer Hydrogenation
作者:Zhaobin Wang、Fujin Ai、Zheng Wang、Wanxiang Zhao、Guangyu Zhu、Zhenyang Lin、Jianwei Sun
DOI:10.1021/ja510980d
日期:2015.1.14
organocatalytic transferhydrogenation strategy for the asymmetric synthesis of 1,1-diarylethanes is described. Under mild conditions, a range of 1,1-diarylethanes substituted with an o-hydroxyphenyl or indole unit could be obtained with excellent efficiency and enantioselectivity. We also extended the protocol to an unprecedented asymmetric hydroarylation of 1,1-diarylalkenes with indoles for the synthesis of
Cp*Co(III)-Catalyzed Dearomative [3 + 2] Spiroannulation of 2-Alkenylphenols with Ynamides via C–H Activation
作者:Peng-Peng Lin、Xiang-Lei Han、Guo-Hua Ye、Ji-Lin Li、Qingjiang Li、Honggen Wang
DOI:10.1021/acs.joc.9b01750
日期:2019.10.18
An oxidative [3 + 2] C-H spiroannulation reaction of 2-alkenylphenols with ynamides has been developed toward the synthesis of spiro[4,5]decane derivatives. This dearomative reaction employs earth-abundant cobalt as the metal catalyst and occurs under rather mild reaction conditions (room temperature). The use of ynamides confers unique reactivity and exclusive regioselectivity. The products bearing
Chiral Brønsted acid catalyzed intermolecular Friedel–Crafts alkylation of styrenes with indoles: construction of all-carbon quaternary stereocenters
作者:Ming-Li Li、Dian-Feng Chen、Shi-Wei Luo、Xiang Wu
DOI:10.1016/j.tetasy.2015.01.005
日期:2015.2
A chiralBrønstedacidcatalyzedFriedel–Craftsreaction of terminal 1,1-diaryalkenes with indoles is described. This reaction provides indole derivatives with acyclic all-carbon quaternary stereocenters in excellent yields and with excellent enantioselectivities, and features high atom efficiency without the generation of side products.