Phosphine‐Free Manganese(II)‐Catalyst Enables Acceptorless Dehydrogenative Coupling of Alcohols with Indoles
作者:Vinita Yadav、Ekambaram Balaraman、Santosh B. Mhaske
DOI:10.1002/adsc.202100621
日期:2021.9.21
molecularly defined NNN−Mn(II) pincer complex catalyzed acceptorless dehydrogenative coupling of alcohols with indoles is reported. A wide variety of symmetrical and unsymmetrical bis(indolyl)methane derivatives as well as some structurally important products such as Vibrindole A, Turbomycin B alkaloid, Antileukemic, and Anticancer agents were synthesized. Mechanistic studies illustrate the importance
本文报道了一种空气稳定的、分子定义的 NNN-Mn(II) 钳形复合物催化醇与吲哚的无受体脱氢偶联。合成了多种对称和非对称双(吲哚基)甲烷衍生物以及一些结构上重要的产品,如 Vibrindole A、Turbomycin B 生物碱、抗白血病和抗癌剂。机理研究说明了 NH 部分在配合物中的重要性以及金属-配体合作在催化过程中的关键作用。
Palladium-catalyzed carbonylative bis(indolyl)methanes synthesis with TFBen as the CO source
An efficient and convenient palladium-catalyzed carbonylative procedure for the synthesis of bis(indolyl)methanes has been established for the first time. With TFBen (benzene-1,3,5-triyl triformate) as the solid CO source, aryl iodides and indoles were transformed into the corresponding bis(indolyl)methane derivatives in moderate to excellent yields.
Efficient and Eco-Friendly Process for the Synthesis of Bis(1H-indol-3-yl)methanes using Ionic Liquids
作者:J. S. Yadav、B. V. S. Reddy、S. Sunitha
DOI:10.1002/adsc.200390038
日期:2003.3
compounds in 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF4) or 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF6) ionicliquids under mild reaction conditions to afford the corresponding bis-indolylmethanes in excellent yields. These ionicliquids can be recovered and recycled in subsequent reactions without any apparent loss of activity.
Palladium catalyzed alkylation of indole via aliphatic C–H bond activation of tertiary amine
作者:K. Ramachandiran、D. Muralidharan、P.T. Perumal
DOI:10.1016/j.tetlet.2011.04.110
日期:2011.7
Alkylation of indoles has been achieved via Pd-catalyzed aliphatic C–H bond activation of tertiaryamine coupling with indole followed by C–N bond cleavage and subsequent addition of indole. This method involves the migration of alkane chain from tertiaryamine to indole.
A new organocatalytic procedure for the synthesis of bis(indolyl)methanes with acidic ionic liquid immobilized on silica gel (ILIS-SO2Cl) has been developed. The reaction condition is applicable to a variety of aryl and aliphatic aldehydes and indoles. The mild nature of the reaction conditions showed that the acetoxy or TBDMS group in the aldehyde was maintained intact. The catalyst was reused four times in 93% average yield.