Guanidine–Copper Complex Catalyzed Allylic Borylation for the Enantioconvergent Synthesis of Tertiary Cyclic Allylboronates
作者:Yicen Ge、Xi‐Yang Cui、Siu Min Tan、Huan Jiang、Jingyun Ren、Nicholas Lee、Richmond Lee、Choon‐Hong Tan
DOI:10.1002/anie.201813490
日期:2019.2.18
allylboronates from racemic allylic bromides was achieved by using a guanidine–copper catalyst. The allylboronates were obtained with high γ/α regioselectivities (up to 99:1) and enantioselectivities (up to 99 % ee), and could be further transformed into diverse functionalized allylic compounds without erosion of optical purity. Experimental and DFT mechanistic studies support an SN2′ borylation process
通过使用胍-铜催化剂,由外消旋烯丙基溴对映体合成手性环状烯丙基硼酸酯。获得的烯丙基硼酸酯具有高的γ/α区域选择性(高达99:1)和对映选择性(高达99%ee),并且可以进一步转化为多种功能化的烯丙基化合物,而不会降低光学纯度。实验和DFT机理研究支持单齿胍-铜(I)配合物催化的S N 2'硼化过程,该过程通过特殊的直接对映体转化机理进行。
(Guanidine)copper Complex-Catalyzed Enantioselective Dynamic Kinetic Allylic Alkynylation under Biphasic Condition
作者:Xi-Yang Cui、Yicen Ge、Siu Min Tan、Huan Jiang、Davin Tan、Yunpeng Lu、Richmond Lee、Choon-Hong Tan
DOI:10.1021/jacs.7b12806
日期:2018.7.11
Highly enantioselective allylicalkynylation of racemic bromides under biphasic condition is furnished in this report. This approach employs functionalized terminalalkynes as pro-nucleophiles and provides 6- and 7-membered cyclic 1,4-enynes with high yields and excellent enantioselectivities (up to 96% ee) under mild conditions. Enantioretentive derivatizations highlight the synthetic utility of this
Copper-Catalyzed Asymmetric Allylic Alkylation of Racemic Cyclic Substrates: Application of Dynamic Kinetic Asymmetric Transformation (DYKAT)
作者:Jean-Baptiste Langlois、Alexandre Alexakis
DOI:10.1002/adsc.200900790
日期:2010.2.15
The copper-catalyzedasymmetricallylicalkylation (AAA) is of great interest in organic synthesis. This reaction was extensively studied using a broad range of substrates, ligands and organometallic reagents. However, the use of racemic substrates was still limited. Although some processes of kinetic resolution are reported in the literature, no examples of quantitative deracemization are described
Silver Salt-Mediated Allylation Reactions Using Allyl Bromides
作者:Xiaodong Xiong、Jonathan Wong、Ying-Yeung Yeung
DOI:10.1021/acs.joc.1c00480
日期:2021.5.7
A facile, efficient, and chemoselective synthesis of allylic amides has been developed. Allyl bromides were used as the precursors activated by silver triflate. A Ritter-type reaction readily proceeded to give various allyl amides under mild conditions. The reaction protocol was also applicable to different nucleophilic partners to give a wide range of allyl-substituted products in the absence of a