Synthesis of functionalized 3-isochromanones <i>via</i> metal-free intramolecular alkoxylation-initiated cascade cyclization
作者:Ying-Qi Zhang、Xin-Qi Zhu、Yin Xu、Hao-Zhen Bu、Jia-Le Wang、Tong-Yi Zhai、Jin-Mei Zhou、Long-Wu Ye
DOI:10.1039/c9gc01030k
日期:——
A metal-free intramolecular alkoxylation-initiated cascade cyclization of allyl ether-tethered ynamides has been developed. Various highly functionalized 3-isochromanones can be obtained in generally good to excellent yields under mild reaction conditions. Moreover, this asymmetric cyclization has also been realized via a stereocontrolled [3,3] rearrangement by employing a traceless chiral directing
Dual Nucleophilic/Electrophilic Capture of In Situ Generated Iminium Ethers: Towards the Synthesis of Functionalized Amide Building Blocks
作者:Bo Peng、Daniel H. O'Donovan、Igor D. Jurberg、Nuno Maulide
DOI:10.1002/chem.201203293
日期:2012.12.14
linear amides into a diverse range of branched, functionalized products by conversion to iminium esters is followed by sequential treatment with nucleophiles and electrophiles (see scheme). The method takes advantage of a novel Claisen rearrangement and the use of aromatic substrates greatly facilitates the formation of the intermediate iminiumether.