Rhodium-Catalyzed Asymmetric 1,4-Addition of Aryltitanium Reagents Generating Chiral Titanium Enolates: Isolation as Silyl Enol Ethers
作者:Tamio Hayashi、Norihito Tokunaga、Kazuhiro Yoshida、Jin Wook Han
DOI:10.1021/ja027663w
日期:2002.10.1
triisopropoxide (ArTi(OPr-i )3) to alpha,beta-unsaturated ketones proceeded with high enantioselectivity (94-99.8% ee) in the presence of 3 mol % of [Rh(OH)((S )-binap)]2 in THF at 20 degrees C to give high yields of the titanium enolates as 1,4-addition products. The titanium enolates were converted into silyl enol ethers by treatment with chlorotrimethylsilane and lithium isopropoxide.
Highly efficient synthesis of 1,2-disubstituted acetylenes derivatives from the cross-coupling reactions of 1-bromoalkynes with organotitanium reagents
作者:Chuan Wu、Qing-Han Li
DOI:10.1016/j.tet.2021.132370
日期:2021.9
A Highly efficient route for the synthesis of 1,2-disubstituted acetylene derivatives has been developed by nickel catalyzed cross-couplings of alkynyl halides with aryl titanium reagents under mild conditions. This has given corresponding cross-coupling products good to excellent isolated yields of up to 92 %. The aryls bearing electron-donating or electron-withdrawing groups in either alkynylhalides
Highly efficient synthesis of arylsulfide derivatives from coupling reaction of aryl titanium reagents with N-aryl thiosuccinimides catalyzed by copper under ligand-free conditions
作者:Zhi-Hao Zhang、Jia-Xia Pu、Xiao-Ying Jia、Jin-Song Hou、Li-Rong Han、Chuan Wu、Qing-Han Li
DOI:10.1016/j.jorganchem.2024.123192
日期:2024.7
A highly efficient and simple cross-coupling reactions of aryltitanium reagents with -aryl thiosuccinimides for the synthesis of arylsulfide derivatives using Cu(acac) (20 mol%) as catalyst are reported. Under the optimum reaction conditions, the coupling reaction between (hetero)aryltitanium reagents with -aryl thiosuccinimides can be carried out smoothly, 18–93 % isolated yields of arylsulfides were