New and Efficient Synthesis of 1,3-Dienylphosphonates by Palladium-Catalyzed Substitution of Propargylic Esters to Diethyl Phosphite
作者:Xiao-Ning Liu、Wei-Lei Guo、Chuan-Jin Hou、Xiang-Ping Hu
DOI:10.1080/00397911.2012.725795
日期:2013.10.2
Abstract An efficient route to the synthesis of 1,3-dienylphosphonates (1) has been developed for the first time by the substitution of propargylic esters (2) to the diethyl phosphite (3) nucleophile in the presence of Pd2(dba)3 · CHCl3 (2 mol %) and 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (4 mol%). Both the alkyl and aryl 1,3-dienylphosphonates can be prepared from this transformation. Supplemental
Synthesis of optically active alkynyl alcohols and α-hydroxy esters by microbial asymmetric hydrolysis of the corresponding acetates
作者:Kenji Mori、Hiroko Akao
DOI:10.1016/0040-4020(80)85030-7
日期:1980.1
Asymmetric hydrolysis of the acetates of racemic alkynyl alcohols and α-hydroxy esters by Bacillus subtilis var. Niger afforded optically active acetates and alcohols in 7–90% optical purities. The both enantiomers of optically pure mandelie acid were prepared by this microbial method.
Chiral Tridentate P,N,N Ligands for Highly Enantioselective Copper-Catalyzed Propargylic Amination with both Primary and Secondary Amines as Nucleophiles
作者:Cheng Zhang、Ya-Hui Wang、Xin-Hu Hu、Zhuo Zheng、Jie Xu、Xiang-Ping Hu
DOI:10.1002/adsc.201200589
日期:2012.10.8
enantioselective propargylic amination of propargylic acetates with both primary and secondaryamines as nucleophiles, affording the corresponding propargylicamines in high yields and with excellent enantioselectivities (up to 97% ee for secondaryamines, and up to 96% ee for primary amines). Furthermore, the present catalytic system was also effective for the more challenging aliphatic propargylic acetate
Highly Enantioselective Catalytic Vinylogous Propargylation of Coumarins Yields a Class of Autophagy Inhibitors
作者:Hao Xu、Luca Laraia、Laura Schneider、Kathrin Louven、Carsten Strohmann、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1002/anie.201706005
日期:2017.9.4
A highly enantioselective copper‐catalyzed vinylogous propargylic substitution has been developed. Aromatic and aliphatic propargylic esters react smoothly with substituted coumarins under mild reactionconditions to give the desired products with excellent yields and enantioselectivities. Subsequent single‐step transformations enable the synthesis of a wide range of multifunctional and diverse compounds
Highly Diastereo- and Enantioselective Cu-Catalyzed [3 + 3] Cycloaddition of Propargyl Esters with Cyclic Enamines toward Chiral Bicyclo[<i>n</i>.3.1] Frameworks
作者:Cheng Zhang、Xin-Hu Hu、Ya-Hui Wang、Zhuo Zheng、Jie Xu、Xiang-Ping Hu
DOI:10.1021/ja303129s
日期:2012.6.13
Cu-catalyzed asymmetric [3 + 3] cycloaddition of propargyl esters with cyclic enamines is reported. With a combination of Cu(OAc)(2)·H(2)O and a chiral tridentate ferrocenyl-P,N,N ligand as the catalyst, perfect endo selectivities (endo/exo > 98/2) and excellent enantioselectivities (up to 98% ee) for endo cycloadducts were achieved under mild conditions. This method provides a simple and efficient approach