Catalytic Tandem Friedel–Crafts Alkylation/C4–C3 Ring-Contraction Reaction: An Efficient Route for the Synthesis of Indolyl Cyclopropanecarbaldehydes and Ketones
A general strategy for the synthesis of indolyl cyclopropanecarbaldehydes and ketones via a Brønsted acid-catalyzed indole nucleophilic addition/ring-contraction reaction sequence has been exploited. The procedure leads to a wide panel of cyclopropyl carbonyl compounds in generally high yields with a broad substrate scope.
Photoinduced Dearomatizing Three‐Component Coupling of Arylphosphines, Alkenes, and Water
作者:Yusuke Masuda、Hiromu Tsuda、Masahiro Murakami
DOI:10.1002/anie.202013215
日期:2021.2.15
A unique photoinduced reaction that couples a triarylphosphine, an alkene, and water to produce 2‐(cyclohexa‐2,5‐dienyl)ethylphosphine oxide is reported herein. The alkene inserts into a C(aryl)−P bond of the arylphosphine, the aryl ring is dearomatized into the cyclohexadienyl ring, and the phosphorus is oxidized. The three components are all readily available, and their intermolecular coupling significantly
Palladium-catalyzed N1-selective allylation of indoles with allylic alcohols promoted by titanium tetraisopropoxide
作者:Chieh-Yu Chang、Yu-Huan Lin、Yen-Ku Wu
DOI:10.1039/c8cc09817d
日期:——
This chemistry provides a facile route to a variety of allylated indoles in synthetically useful yields. The utility of this simple allylation reaction was demonstrated with the first total synthesis of (+)-N-(4′-hydroxyprenyl)-cyclo(alanyltryptophyl), which was completed in five steps, starting from L-tryptophan methylester hydrochloride.
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。