A new efficient strategy for the synthesis of 3‐trifluoromethyl‐indoles was developed through tandemcyclization/trifluoromethylation of 2‐alkynylanilines and Umemoto's reagent under effect of CuBr. The reaction features the use of cheap copper salt, mild reaction conditions and high yield of products. The preliminary mechanism study indicates the solvent dimethylacetamide acts as the role of dealkylation
Palladium-Catalyzed Coupling of<i>ortho</i>-Alkynylanilines with Terminal Alkynes Under Aerobic Conditions: Efficient Synthesis of 2,3-Disubstituted 3-Alkynylindoles
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201205596
日期:2012.12.3
Two nucleophiles, one triple bond: Under aerobic conditions, palladium‐catalyzed direct coupling of o‐alkynylanilines and terminalalkynes took place smoothly to afford the 2,3‐disubstituted 3‐alkynylindoles 3 in good to excellent yields. The intermediate A was characterized and a retro‐aminopalladation of B was observed for the first time.
synthesis of N-methyl-3-chalcogeno-indoles has been developed via iodine-mediatedelectrophilicannulation reactions of 2-alkynylaniline derivatives with disulfides or diselenides. In the presence of iodine and iron, a variety of 2-alkynylanilines selectively underwent the electrophilicannulation with numerous disulfides or diselenides leading to the corresponding 3-sulfenylindoles and 3-selenenylindoles
Palladium(II)-Catalyzed Cyclizative Cross-Coupling of<i>ortho</i>-Alkynylanilines with<i>ortho</i>-Alkynylbenzamides under Aerobic Conditions
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201307738
日期:2013.12.2
Born to couple: The Pd(OAc)2‐catalyzed reaction of o‐alkynylanilines (1) with o‐alkynylbenzamides (2) affords the cyclizative cross‐coupling products 3 in good to excellent yields. Three bonds are created in the formation of two heterocycles tethered by a tetrasubstituted double bond. Mechanistic studies indicate that the reaction is initiated by aminopalladation with subsequent oxypalladation, N‐demethylation
Treatment of homopropargylic alcohol derivatives or phenylacetylene compounds with phenylmagnesium bromide in the presence of a catalytic amount of manganese(II) chloride afforded phenylated products in good yields with high regio- and stereoselectivities.
在催化量的氯化锰 (II) 存在下,用溴化苯基镁处理高炔丙醇衍生物或苯乙炔化合物,以高产率和高区域选择性和立体选择性提供苯化产物。