An Efficient Approach for Monofluorination via Highly Regioselective Fluorohydroxylation Reaction of 3-Aryl-1,2-allenes with Selectfluor
摘要:
The internal C-C double bond in 3-aryl-1,2-allenes was highly regioselectively fluorohydroxylated to afford 2-fluoroalken-3-ols in 37-88% yields by using Selectfluor as the electrophilic reagent. The regioselectivity may be determined by the electronic effect, while the reactivity may be controlled by the stabilization effect of the aryl group in the allylic cationic intermediates.
Highly Selective Mild Stepwise Allylation of <i>N</i>-Methoxybenzamides with Allenes
作者:Rong Zeng、Chunling Fu、Shengming Ma
DOI:10.1021/ja303790s
日期:2012.6.13
allylation of N-methoxybenzamides 1 with polysubstituted allenes is reported. This C-H functionalization involving allenes is conducted under very mild conditions (-20 °C or room temperature) and compatible with ambient air and moisture, and it can be applied to terminal or internal allenes with different synthetically attractive functional groups. Highly efficient axial chirality transfer has been realized
报道了 N-甲氧基苯甲酰胺 1 与多取代丙二烯的有效 Rh(III) 催化逐步邻位烯丙基化。这种涉及丙二烯的 CH 官能化是在非常温和的条件下(-20 °C 或室温)进行的,并且与环境空气和水分兼容,它可以应用于具有不同合成吸引力官能团的末端或内部丙二烯。已经实现了高效的轴向手性转移,产生了光学活性内酯。
An Efficient Approach to 2-Bromoalken-3-ols by Regioselective Bromohydroxylation Reaction of Simple Allenes with NBS
作者:Wangqing Kong、Binjie Guo、Chunling Fu、Shengming Ma
DOI:10.1002/ejoc.201001676
日期:2011.4
A regioselectivebromohydroxylationreaction of simpleallenes affording 2-bromoalken-3-ols in moderate-to-good yields has been developed by using NBS as the electrophilic reagent in a mixture of 1,4-dioxane/H 2 O (1:1) at room temperature. Through this study it has been concluded that the regioselectivity is determined by various factors including steric and electronic effects of the substituents
通过在 1,4-二恶烷/H 2 O (1:1) 混合物中使用 NBS 作为亲电试剂,开发了简单丙二烯的区域选择性溴羟基化反应,以中等至良好的收率提供 2-bromoalken-3-ols在室温下。通过这项研究得出的结论是,区域选择性由各种因素决定,包括丙二烯部分取代基的空间和电子效应。
Highly Regioselective Radical Amination of Allenes: Direct Synthesis of Allenamides and Tetrasubstituted Alkenes
The first controllable, regioselectiveradicalamination of allenes with N‐fluoroarylsulfonimide is described to proceed under very mild reaction conditions. With this methodology, a general and straightforward route for the synthesis of both allenamides and fluorinated tetrasubstitutedalkenes was realized from a wide range of terminal and internal allenes.
Copper-Catalyzed Intermolecular Trifluoromethylazidation and Trifluoromethylthiocyanation of Allenes: Efficient Access to CF<sub>3</sub>-Containing Allyl Azides and Thiocyanates
作者:Na Zhu、Fei Wang、Pinhong Chen、Jinxing Ye、Guosheng Liu
DOI:10.1021/acs.orglett.5b01677
日期:2015.7.17
A mild and efficient method for copper-catalyzedtrifluoromethylazidation and trifluoromethylthiocyanation of allenes was explored. A series of CF3-containing allyl azides and thiocyanates were obtained with high yields and good stereoselectivities, which can be used for further transformation to some valuable compounds.
Organozinc Reagents in DMSO Solvent: Remarkable Promotion of S<sub>N</sub>2′ Reaction for Allene Synthesis
作者:Koji Kobayashi、Hiroshi Naka、Andrew E. H. Wheatley、Yoshinori Kondo
DOI:10.1021/ol801249w
日期:2008.8.7
The S N2' reaction of propragyl mesylates with organozinc reagents was dramatically improved in DMSOsolvent, and the stereoselective conversion of chiral substrates was successfully achieved using LiCl-free diorganozinc without the loss of optical purity.