An efficient iron-catalyzed C3-selective formylation of free (N–H) or N-substituted indoles was developed by employing formaldehyde and aqueous ammonia, with air as the oxidant. This new method gave 3-formylindoles in moderate to excellent yields with fairly short reaction times. Moreover, this procedure for catalytic formylation of indoles can be applied to gram-scale syntheses.
Selective hydroboration of equilibrating allylic azides
作者:Ruzhang Liu、Yuanyuan Zhang、Jun Xu
DOI:10.1039/d1cc02520a
日期:——
The iridium(I)-catalyzed hydroboration of equilibrating allylic azides is reported to provide only the anti-Markovnikov product of alk-1-ene isomers in good yields and with good functional group tolerance.
据报道,平衡的烯丙基叠氮化物的铱( I ) 催化硼氢化仅以良好的收率和良好的官能团耐受性提供了烷-1-烯异构体的反马尔科夫尼科夫产物。
Base‐Mediated Radical Borylation of Alkyl Sulfones
作者:Mingming Huang、Jiefeng Hu、Ivo Krummenacher、Alexandra Friedrich、Holger Braunschweig、Stephen A. Westcott、Udo Radius、Todd B. Marder
DOI:10.1002/chem.202103866
日期:2022.1.13
The utilization of inactivated alkyl sulfones as alkylradical precursors in a base-mediated borylation reaction with B2neop2 is reported, allowing direct access to valuable alkyl boronate esters without further transesterification. This approach is scalable and is tolerant to a variety of functional groups and substrates including complex molecules.
据报道,在与 B 2 neop 2的碱介导的硼基化反应中,利用失活的烷基砜作为烷基自由基前体,从而无需进一步酯交换即可直接获得有价值的烷基硼酸酯。这种方法具有可扩展性,并且能够耐受各种官能团和底物,包括复杂分子。
A one-pot access to cycloalkano[1,2-a]indoles through an intramolecular alkyl migration reaction in indolylborates
作者:Minoru Ishikura、Wataru Ida、Kazuo Yanada
DOI:10.1016/j.tet.2005.10.045
日期:2006.1
protocol for the preparation of cycloalkano[1,2-a]indoles by way of an intramolecular alkylmigration reaction in cyclic indolylborates is described. NaOMe was found to act as a successful trialkylboryl-protecting group against to the lithiation at the C2 of the indole ring. Treatment of cyclic indolylborates with electrophiles produced cycloalkano-[1,2-a]indoles.
描述了一种新颖的一锅法,用于通过环状吲哚硼酸酯中的分子内烷基迁移反应制备环烷[1,2- a ]吲哚。发现NaOMe可作为成功的三烷基硼基保护基团来抵抗吲哚环C2上的锂化。用亲电试剂处理环状吲哚硼酸酯产生环烷-[1,2- a ]吲哚。
Iodine-catalyzed C3-formylation of indoles using hexamethylenetetramine and air
An efficient iodine-catalyzed chemoselective 3-formylation of free (N–H) and N-substituted indoles was achieved by using hexamethylenetetramine (HMTA) in the presence of activated carbon under air atmosphere. This new method could provide 3-formylindoles in moderate to excellent yields with fairly short reaction times. Moreover, this catalytic formylation of indoles procedure can be applied to gram-scale