Regioselective and Stereoselective Entry to β,β-Disubstituted Vinyl Ethers via the Sequential Hydroboration/Suzuki–Miyaura Coupling of Ynol Ethers
作者:Weijian Cui、Mengyi Mao、Zuying He、Gangguo Zhu
DOI:10.1021/jo401523m
日期:2013.10.4
A highly regio- and stereoselectivesynthesis of stereodefined β,β-disubstituted alkenyl ethers featuring the sequential hydroboration/Suzuki–Miyaura coupling of ynol ethers has been described. A number of functional groups, including OMe, Ac, CO2Et, CN, halides, and alkyl, (hetero)aryl, and alkenyl groups, are well-tolerated under the reaction conditions. Furthermore, it allows a facile entry to the
Silver-Catalyzed Regio- and Stereoselective Addition of Carboxylic Acids to Ynol Ethers
作者:Jing Yin、Yihui Bai、Mengyi Mao、Gangguo Zhu
DOI:10.1021/jo501615a
日期:2014.10.3
enol esters in good yields with excellent regio- and stereoselectivity. Meaningfully, the Ni-catalyzed selective coupling of alkenyl C–OPiv bonds of (Z)-α-alkoxy enol esters with boronic acids enables a convenient route to the access of (E)-enol ethers. As such, the two-step procedure, consisted of a hydrocarboxylation and a subsequent Suzuki–Miyaura coupling, offers a formal trans hydroarylation of
Highly Site Selective Formal [5+2] and [4+2] Annulations of Isoxazoles with Heterosubstituted Alkynes by Platinum Catalysis: Rapid Access to Functionalized 1,3-Oxazepines and 2,5-Dihydropyridines
作者:Wen-Bo Shen、Xin-Yu Xiao、Qing Sun、Bo Zhou、Xin-Qi Zhu、Juan-Zhu Yan、Xin Lu、Long-Wu Ye
DOI:10.1002/anie.201610042
日期:2017.1.9
Platinum‐catalyzed formal [5+2] and [4+2] annulations of isoxazoles with heterosubstituted alkynes enabled the atom‐economical synthesis of valuable 1,3‐oxazepines and 2,5‐dihydropyridines, respectively. Importantly, this Pt catalysis not only led to unique reactivity dramatically divergent from that observed under Au catalysis, but also proceeded via unprecedented α‐imino platinum carbene intermediates
One-Pot Reaction of Carboxylic Acids and Ynol Ethers for The Synthesis of β-Keto Esters
作者:Linwei Zeng、Zhencheng Lai、Sunliang Cui
DOI:10.1021/acs.joc.8b02715
日期:2018.12.7
An one-pot reaction of carboxylic acids and ynol ethers for the synthesis of β-keto esters has been developed. Under promotion of Ag2O, various carboxylic acids and ynol ethers could transform to α-acyloxy enol esters, which undergo a following DMAP-catalyzed rearrangement to deliver β-keto esters rapidly. This method provides a direct approach to β-keto esters from carboxylic acids without any preactivation
One-Pot Reaction of Carboxylic Acids, Ynol Ethers, and <i>m</i>-CPBA for Synthesis of α-Carbonyloxy Esters
作者:Linwei Zeng、Hironao Sajiki、Sunliang Cui
DOI:10.1021/acs.orglett.9b02323
日期:2019.8.16
one-pot reaction of carboxylic acids, ynol ethers, and m-CPBA for the synthesis of α-carbonyloxy esters in the presence of Ag2O is described. This process provides a direct approach to α-carbonyloxy esters with the achievement of formation of three C–O bonds. The protocol is featured with readily available starting materials and broad substrate scope. Control reactions and isotope-labeling reactions were