Synthesis of 2-Benzylphenyl Ketones by Aryne Insertion into Unactivated C–C Bonds
摘要:
A transition-metal-free procedure to access to functionalized 2-benzylphenyl ketones is described by direct insertion of arynes into benzylic C-C bonds. This reaction was promoted by cesium fluoride at room temperature, allowing the products to form in high selectivity and achieve good functional group tolerance.
Enantioselective Michael Addition of Photogenerated <i>o</i>-Quinodimethanes to Enones Catalyzed by Chiral Amino Acid Esters
作者:Xiaoqian Yuan、Shupeng Dong、Zhen Liu、Guibing Wu、Chuncheng Zou、Jinxing Ye
DOI:10.1021/acs.orglett.7b00862
日期:2017.5.5
The first example of a photoexcitated amine-catalyzed process for asymmetric Michael addition of o-quinodimethanes to enones is described. In the presence of simple chiralamino acid esters, a variety of Michael adducts were generally obtained in good yields and excellent stereoselectivities. This strategy can be successfully applied to 3-substituted-2-cyclohexenones and provides an asymmetric access
A diastereo- and enantioselective photoenolization/Mannich (PEM) reaction of ortho-alkyl aromatic ketones with benzosulfonimides was established by utilizing a chiral N,N′-dioxide/Ni(OTf)2 complex as the Lewis acid catalyst. It afforded a series of benzosulfonamides and the corresponding ring-closure products, and a reversal of diastereoselectivity was observed through epimerization of the benzosulfonamide
Synthesis of 2-Benzylphenyl Ketones by Aryne Insertion into Unactivated C–C Bonds
作者:Bin Rao、Jinghua Tang、Xiaoming Zeng
DOI:10.1021/acs.orglett.6b00578
日期:2016.4.1
A transition-metal-free procedure to access to functionalized 2-benzylphenyl ketones is described by direct insertion of arynes into benzylic C-C bonds. This reaction was promoted by cesium fluoride at room temperature, allowing the products to form in high selectivity and achieve good functional group tolerance.
The Synthesis and Cyclization of Some o-Benzylphenones<sup>1,2</sup>
作者:Frank A. Vingiello、James G. Van Oot、H. Hayden Hannabass