Metal-Free Method for Direct Synthesis of Functionalized β-Ketoenamines
作者:Xiaobao Zeng、Chulong Liu、Weiguang Yang、Yunxiang Weng、Xinyan Wang、Yuefei Hu
DOI:10.1021/acs.joc.8b03247
日期:2019.3.15
A new method for direct synthesis of β-ketoenamines was developed by a BF3·OEt2-catalyzed cyclization of 1-iodoalkyne and α-keto acid followed by an amine-mediated ring-opening in one pot. Its metal-free conditions allowed the easy synthesis of those products bearing the transition metal-sensitive functional groups. Its three-component process achieved wide range of functionalized products.
A general two-step one-pot synthesis process of ynones from α-keto acids and 1-iodoalkynes
作者:Xiaobao Zeng、Chulong Liu、Weiguang Yang、Xingyong Wang、Xinyan Wang、Yuefei Hu
DOI:10.1039/c8cc05429k
日期:——
A general two-step one-pot synthesis process of ynones was developed by cycloaddition of α-keto acids and 1-iodoalkynes followed by a ring-opening reaction. Its easy conditions and novel mechanism endowed it with two distinctive advantages: iodine-atom bonded to C(sp2) remained intact and α-keto acids became a part of the triple bonds in ynones.
Chemoselective and stereospecific iodination of alkynes using sulfonium iodate(<scp>i</scp>) salt
作者:Dodla S. Rao、Thurpu R. Reddy、Sudhir Kashyap
DOI:10.1039/c7ob03076b
日期:——
An efficient and highly chemoselective iodination of alkynes using a sulfoniumiodate(I) electrophilc reagent under metal-free conditions has been realized. The reactivity of sulfoniumiodate(I) salt could be significantly diverse in the presence of water as the solvent, enabling the (E)-1,2-diiodoalkenes stereospecifically. This stereodivergent approach is amenable to a wide range of alkyne substrates
A Highly Efficient Gold-Catalyzed Photoredox α-C(sp<sup>3</sup>)H Alkynylation of Tertiary Aliphatic Amines with Sunlight
作者:Jin Xie、Shuai Shi、Tuo Zhang、Nina Mehrkens、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201412399
日期:2015.5.11
A new α‐C(sp3)H alkynylation of unactivated tertiaryaliphaticamines with 1‐iodoalkynes as radical alkynylating reagents in the presence of [Au2(μ‐dppm)2]2+ in sunlight provides propargylic amines. Based on mechanistic studies, a CC coupling of an α‐aminoalkyl radical and an alkynyl radical is proposed for the C(sp3)C(sp) bond formation. The mild, convenient, efficient, and highly selective C(sp3)H