Enantioselective Synthesis of Tertiary α,α-Diaryl Carbonyl Compounds Using Chiral <i>N,N′</i>-Dioxides under Umpolung Conditions
作者:Tae-Woong Um、Girim Lee、Seunghoon Shin
DOI:10.1021/acs.orglett.0c00333
日期:2020.3.6
addition of the chiral N,N'-dioxide into ynamides generated enolonium ions in situ which underwent enantioselective alkylation by indoles, pyrroles, and phenols, without racemization of the formed tertiary center. This external oxidant approach allows for the use of unmodified nucleophiles and does not leave trace groups from the oxidant, which significantly increases the synthetic efficiency and the
Gold-Catalyzed Intermolecular [4+2] and [2+2+2] Cycloadditions of Ynamides with Alkenes
作者:Ramesh B. Dateer、Balagopal S. Shaibu、Rai-Shung Liu
DOI:10.1002/anie.201105921
日期:2012.1.2
As good as gold: Gold‐catalyzedintermolecular [4+2] cycloadditions of 2‐arylynamides with alkenes and gold‐catalyzed [2+2+2] cycloadditions of terminal ynamides with enol ethers have been developed (see scheme). The [4+2] cycloaddition is compatible with a range of alkenes and arylynamides and the [2+2+2] cycloaddition can also accommodate a variety of different arylynamide and enol ether substrates
Regiocontrolled Gold-Catalyzed [2+2+2] Cycloadditions of Ynamides with Two Discrete Nitriles to Construct 4-Aminopyrimidine Cores
作者:Somnath Narayan Karad、Rai-Shung Liu
DOI:10.1002/anie.201405312
日期:2014.8.18
Reported herein is the novel gold‐catalyzedintermolecular [2+2+2] cycloaddition of ynamides with two discrete nitriles to form monomeric 4‐aminopyrimidines, which are pharmaceutically important structural motifs. The utility of this new cycloaddition is demonstrated by the excellent regioselectivity obtained using a variety of ynamides and nitriles.
Et2Zn-promoted β-trans-selective hydroboration of ynamide
作者:Kefeng Wang、Zixi Zhuang、Huihui Ti、Peishan Wu、Xin Zhao、Honggen Wang
DOI:10.1016/j.cclet.2019.11.008
日期:2020.6
Abstract The trans-hydroboration of alkyne represents a challenging task in organic synthesis. Reported herein is an Et2Zn promoted β-trans hydroboration of ynamides by using N-heterocyclic carbene (NHC)-ligated borane as boryl source. The reaction leads to a stereoselective construction of enamides bearing a valuable boryl substituent. Both aromatic and aliphatic ynamides were applicable to the reaction
Gold-catalyzed [3+2]-annulations of α-aryl diazonitriles with ynamides and allenamides to yield 1-amino-1H-indenes
作者:RahulKumar Rajmani Singh、Samir Kundlik Pawar、Min-Jie Huang、Rai-Shung Liu
DOI:10.1039/c6cc04308a
日期:——
Abstract: Gold-catalyzed [3+2]-annulations of [small alpha]-aryl diazonitriles with ynamides and allenamides yield 1-amino-1H-indenes in two distinct pathways; the success of these annulations relies on the high electrophilicity of [small alpha]-cyano arylgold carbenes...