2-(naphthalen-1-yl)anilines and p-benzoquinones through copper (II)-mediated radicalcyclisation. This unusual cyclisationreaction resulted in the robust and efficient syntheses of iptycenes with an acridinone motif. These iptycenes can be further transformed to planar acridinone heterocyclics through the Diels–Alder reaction.
Palladium-Catalyzed Directed Atroposelective C–H Allylation via β-H Elimination: 1,1-Disubstituted Alkenes as Allyl Surrogates
作者:Bei-Bei Zhan、Zhen-Sheng Jia、Jun Luo、Liang Jin、Xu-Feng Lin、Bing-Feng Shi
DOI:10.1021/acs.orglett.0c03757
日期:2020.12.18
C–H allylation with 1,1-disubstituted alkenes via β-H elimination remains challenging, because of the low reactivity and difficulty of controlling selectivity. Herein, the development of a Pd(II)-catalyzed directed atroposelective C–H allylation with methacrylates is described. Exclusive allylic selectivity was achieved. A vast array of axially chiral biaryl-2-amines are efficiently synthesized with
TfOH-promoted Classical Nazarov-type Cyclization of Benzofulvenes: Synthesis of Polycyclic 5<i>H</i>,10′<i>H</i>-spiro[benzo[<i>k</i>]phenanthridine-5,6′-dibenzopentalenes]
The reaction of o-benzofulvene with TfOH leads to intramolecular cyclization through novel C–C and C–N bond formation, resulting in the formation of 5H,10′H-spiro[benzo[k]phenanthridine-5,6′-dibenzopentalene]. This protocol provides a new molecular framework with reasonable to excellent yields and tolerates various electron-withdrawing/donating substituents. This method yields diastereoselectivity
Synthesis of Axially Chiral Biaryl‐2‐amines by Pd
<sup>II</sup>
‐Catalyzed Free‐Amine‐Directed Atroposelective C−H Olefination
作者:Bei‐Bei Zhan、Lei Wang、Jun Luo、Xu‐Feng Lin、Bing‐Feng Shi
DOI:10.1002/anie.201915674
日期:2020.2.24
A simple and ubiquitously present group, free amine, is used as a directing group to synthesize axially chiral biaryl compounds by PdII -catalyzed atroposelective C-H olefination. A broad range of axially chiral biaryl-2-amines can be obtained in good yields with high enantioselectivities (up to 97 % ee). Chiral spiro phosphoricacid (SPA) proved to be an efficient ligand and the loading could be reduced
Synthesis of Axially Chiral Biaryls through Cobalt(II)‐Catalyzed Atroposelective C−H Arylation
作者:Yong‐Jie Wu、Zhen‐Kai Wang、Zhen‐Sheng Jia、Jia‐Hao Chen、Fan‐Rui Huang、Bei‐Bei Zhan、Qi‐Jun Yao、Bing‐Feng Shi
DOI:10.1002/anie.202310004
日期:2023.10.2
Cobalt-catalyzed atroposelective C−Harylation/DKR reaction was realized. This strategy provides an efficient and sustainable method for the synthesis of axiallychiral biaryl-2-amines in good yields (up to 99 %) with excellent enantioselectivities (up to 99 %ee).