作者:Douglas C. Behenna、Justin T. Mohr、Nathaniel H. Sherden、Smaranda C. Marinescu、Andrew M. Harned、Kousuke Tani、Masaki Seto、Sandy Ma、Zoltán Novák、Michael R. Krout、Ryan M. McFadden、Jennifer L. Roizen、John A. Enquist、David E. White、Samantha R. Levine、Krastina V. Petrova、Akihiko Iwashita、Scott C. Virgil、Brian M. Stoltz
DOI:10.1002/chem.201003383
日期:2011.12.9
functions with nearly identical efficiency in terms of yield and enantioselectivity. Catalyst discovery and development, the optimization of reaction conditions, the exploration of reactionscope, and applications in target‐directed synthesis are reported. Experimental observations suggest that these alkylationreactions occur through an unusual inner‐sphere mechanism involving binding of the prochiral
α-Arylcarboxylic acid amides were synthesized by reacting silyl enol ethers of aryl ketones and 2-azido-1,3-dimethylimidazolinium hexafluorophosphate (ADMP, 1). Silyl enol ethers react with ADMP 1 to give N-(α-arylacyl)guanidines via the migration of aryl groups in enol ethers. The products were transformed to the corresponding α-aryl acetamides by treating with LiAlH4.
Enantioselective N-Heterocyclic Carbene Catalyzed Synthesis of Functionalized Indenes
作者:Changhe Zhang、David W. Lupton
DOI:10.1021/acs.orglett.7b01981
日期:2017.9.1
An enantioselective NHC (N-heterocycliccarbene) catalyzed synthesis of indenes from bifunctional α,β-unsaturated acyl fluorides and TMS enol ethers has been discovered. The reaction has broad generality (31 examples) and proceeds with high levels of enantioselectivity (most >92:8 er). Mechanistically the reaction likely occurs via a Michael/β-lactonization/decarboxylation sequence. Derivatization
C−O coupling of Malonyl Peroxides with Enol Ethers
<i>via</i>
[5+2] Cycloaddition: Non‐Rubottom Oxidation
作者:Vera A. Vil'、Evgenii S. Gorlov、Oleg V. Bityukov、Yana A. Barsegyan、Yulia E. Romanova、Valentina M. Merkulova、Alexander O. Terent'ev
DOI:10.1002/adsc.201900271
日期:2019.7.2
Malonyl peroxides act both as oxidants and reagents for C−O coupling in reactions with methyl and silyl enol ethers. In the proposed conditions, the oxidative C−O coupling of malonyl peroxides with enol ethers selectively proceeds, bypassing the traditional Rubottom hydroxylation of enol ethers by peroxides. It was observed that the oxidative [5+2] cycloaddition of malonyl peroxides and enol ethers
Visible Light-Induced Methoxycarbonyldifluoromethylation of Trimethylsilyl Enol Ethers and Allyltrimethylsilanes with FSO<sub>2</sub>
CF<sub>2</sub>
CO<sub>2</sub>
Me
作者:Wei Yu、Yao Ouyang、Xiu-Hua Xu、Feng-Ling Qing
DOI:10.1002/cjoc.201800318
日期:2018.11
omethylation of trimethylsilyl enol ethers with FSO2CF2CO2Me in the presence of fac‐Ir(ppy)3 was developed. This reaction provided a practical strategy for the construction of various α‐CF2CO2R aromatic ketones, which are difficult to access by other methods. Furthermore, a series of methoxycarbonyldifluoromethylated allylic compounds could also be obtained from allyltrimethylsilanes using the same
在fac -Ir(ppy)3存在下,用FSO 2 CF 2 CO 2 Me对三甲基甲硅烷基烯醇醚进行了光催化甲氧基羰基二氟甲基化反应。该反应的各种α-CF的构造提供了一种实用的策略2 CO 2 - [R芳族酮,这是难以通过其它方法获得。此外,也可以使用相同策略从烯丙基三甲基硅烷获得一系列甲氧基羰基二氟甲基化的烯丙基化合物。所得的含CF 2 CO 2 R的产品是有用的组成部分,在药物化学和材料科学中具有潜在的价值。