Iridium-Catalyzed Asymmetric Addition of Thiophenols to Oxabenzonorbornadienes
作者:Sifeng Li、Zhiwu Lu、Ling Meng、Jun Wang
DOI:10.1021/acs.orglett.6b02592
日期:2016.10.21
A highly efficient asymmetric ring addition reaction of oxabenzonorbornadienes with thiophenols using an iridium/(S)-xyl-binap catalyst is developed. This catalyst system overcomes catalyst poisoning and background reactions and allows the formation of exclusive thiol addition products in high yields (up to 97% yield) with excellent enantioselectivities (up to 98% ee). Particularly noteworthy is that
Directing-Group-Controlled Ring-Opening Addition and Hydroarylation of Oxa/azabenzonorbornadienes with Arenes via C–H Activation
作者:Keyang Zhang、Ruhima Khan、Jingchao Chen、Xuexin Zhang、Yang Gao、Yongyun Zhou、Kangkui Li、Youxian Tian、Baomin Fan
DOI:10.1021/acs.orglett.0c00765
日期:2020.5.1
rhodium-catalyzed additionreaction of oxa/azabicylic alkenes with aromatic ketones and benzoic acids has been developed. The ketones and benzoic acids afforded different addition products when reacted with oxa/azabicyclic alkenes. The reaction between ketones and azabenzonorbornadienes furnished the ring-opening addition products. The reaction between benzoic acids and aza/oxabicyclic alkenes proceeded in
Benzocarbazole Synthesis via Visible-Light-Accelerated Rh(III)-Catalyzed C–H Annulation of Aromatic Amines with Bicyclic Alkenes
作者:Yichun Wang、Deyang Jia、Jing Zeng、Yuming Liu、Xiubin Bu、Xiaobo Yang
DOI:10.1021/acs.orglett.1c02709
日期:2021.10.15
A visible-light-accelerated Rh(III)-catalyzed C–H annulation of aromatic amines with bicyclic alkenes for the synthesis of benzocarbazole derivatives was developed. In this approach, with the cooperation of rhodium catalysis and visible-light irradiation, various aromatic amines reacted with oxabicyclic alkenes and azabicyclic alkenes smoothly at room temperature, delivering the corresponding bridged
开发了一种用于合成苯并咔唑衍生物的可见光加速 Rh(III) 催化芳胺与双环烯烃的 C-H 环化。在该方法中,在铑催化和可见光照射的协同作用下,各种芳香胺与氧杂双环烯烃和氮杂双环烯烃在室温下顺利反应,以良好的收率得到相应的桥连氧杂或氮杂四氢苯并咔唑。此外,通过进一步的一锅芳构化,方便地合成了一系列苯并[ b ]咔唑。通过定向基团去除、衍生化、放大反应和荧光研究证明了该方法的潜力。
One-pot synthesis of benzo[<i>b</i>]fluorenones <i>via</i> a cobalt-catalyzed MHP-directed [3+2] annulation/ring-opening/dehydration sequence
have developed a one-pot synthesis of benzo[b]fluorenones via a cobalt-catalyzed [3+2] annulation of oxabicyclic alkenes followed by a ring-opening/dehydration sequence in good to excellent yields. With the use of 2-(1-methylhydrazinyl)pyridine (MHP), first explored by our group as the bidentate directing group in C–H functionalization of benzoic hydrazides, the new reaction sequence proceeded smoothly
我们已经开发了一种通过一锅合成的苯并[ b ]芴酮的方法,该方法是通过钴催化的氧杂双环烯烃的[3 + 2]环化反应,然后以开环/脱水顺序进行的,收率很好。我们小组首先探索使用2-(1-甲基肼基)吡啶(MHP)作为苯甲酰肼的CH官能化中的双齿导向基团,新的反应顺序进行得很顺利,并能耐受各种官能团,具有便利的可扩展性。值得注意的是,氧气在反应系统中充当绿色氧化剂。仔细调整反应参数可确保通过二氢环氧苯并芴酮中间体的芳构化直接合成苯并[ b ]芴酮。
Cobalt-Catalyzed Diastereoselective [4+2] Annulation of Phosphinamides with Heterobicyclic Alkenes at Room Temperature
作者:Rajender Nallagonda、Neetipalli Thrimurtulu、Chandra M. R. Volla
DOI:10.1002/adsc.201701162
日期:2018.1.17
Cobalt‐catalyzed sp2 C−H bond functionalization of diarylphosphinamides with heterobicyclic alkenes was demonstrated at roomtemperature employing commercially available cobalt(II)‐salts. The effectiveness of this strategy was illustrated with the reaction of various 8‐aminoquinoline derived phosphinic amides and 7‐oxa/azabenzonorbornadienes. The reaction conditions exhibited excellent functional group tolerance