Asymmetric Transfer Hydrogenation of Heterobicyclic Alkenes with Water as Hydrogen Source
作者:Guoli Shen、Jingchao Chen、Dandan Xu、Xia Zhang、Yongyun Zhou、Baomin Fan
DOI:10.1021/acs.orglett.9b00059
日期:2019.3.1
The asymmetric transfer hydrogenation of heterobicyclic alkenes was accomplished by using water as the sole hydrogensource. The transformation was co-catalyzed by Pd(OAc)2/Zn(OTf)2 dual catalyst with metallic zinc as reducing agent. Various azabenzonorbornadienes and oxabenzonorbornadienes were transformed to the corresponding chiral 1,2-dihydronaphthalenes by the asymmetric reductive ring-opening
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
Three-Component Cycloaddition To Synthesize Aziridines and 1,2,3-Triazolines
作者:Shuqi Chen、Yongqi Yao、Wen Yang、Qifu Lin、Lin Wang、Huanyong Li、Donghan Chen、Yun Tan、Dingqiao Yang
DOI:10.1021/acs.joc.9b01713
日期:2019.9.20
An efficient three-component cycloaddition of oxa(aza)bicyclic alkenes/norbornene in the presence of NaN3 and arylsulfonyl chlorides was developed, affording the corresponding aziridine products in good yields (up to 82%) with moderate to good endo/exo selectivities (up to >99:1 endo/exo). Further studies showed that the cycloaddition of oxa(aza)bicyclic alkenes in the presence of NaN3 and chloroalkanes
High‐valent cyclopentadienyl cobalt catalysis is a versatile tool for sustainable C−H bond functionalizations. To harness the full potential of this strategy, control of the stereoselectivity of these processes is necessary. Herein, we report highly enantioselective intermolecular carboaminations of alkenes through C−H activation of N‐phenoxyamides catalyzed by CoIII‐complexes equipped with chiral
高价的环戊二烯基钴催化是实现可持续CH键功能化的通用工具。为了充分利用这种策略的潜力,必须控制这些过程的立体选择性。在本文中,我们报道了通过配备有手性环戊二烯基(Cp x)配体的Co III络合物催化的N苯氧酰胺的C H活化,对烯烃进行高度对映选择性的分子间碳胺化反应。该方法可在非常温和的条件下将广泛使用的丙烯酸酯以及双环烯烃转化为有吸引力的对映体富集的异酪氨酸衍生物,以及经过精制的氨基取代的双环支架。概述的反应性是Cp x Co III特有的 与4d和5d贵金属催化剂的反应性互补。
Palladium-Catalyzed <i>syn</i>-Stereocontrolled Ring Opening of Oxabicyclic Alkenes with Arylsulfonyl Hydrazides
作者:Donghan Chen、Yongqi Yao、Wen Yang、Qifu Lin、Huanyong Li、Lin Wang、Shuqi Chen、Yun Tan、Dingqiao Yang
DOI:10.1021/acs.joc.9b01957
日期:2019.10.4
A novel palladium-catalyzed ring-opening reaction of oxabicyclic alkenes with arylsulfonylhydrazides was first developed. In this work, we provide an efficient one-pot reaction to afford the corresponding cis-2-aryl-1,2-dihydronaphthalen-1-ols and 2-aryl-naphthalenes in moderate to excellent yields (up to 95%) under an open-air condition. Various types of functional groups attached to the substrates