报道了N-烯丙基吲哚-2-甲醛和N-烯丙基吡咯-2-甲醛的催化对映选择性加氢酰化。与形成六元环的许多烯烃加氢酰化相反,这些环化过程是在不存在稳定酰基铑(III)氢化物中间体的辅助官能团的情况下发生的。分子内加氢酰化反应以中等至高产率生成具有优异对映选择性的7,8-二氢吡啶并[1,2- a ]吲哚-9(6 H )-酮和 6,7-二氢吲哚嗪-8(5 H )-酮。
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.
Cooperative Catalysis Approach to Intramolecular Hydroacylation
作者:Evgeny V. Beletskiy、Ch. Sudheer、Christopher J. Douglas
DOI:10.1021/jo300779q
日期:2012.7.20
examples of hydroacylation to form six- and seven-membered ring ketones require either embedded chelating groups or other substrate design strategies to circumvent competitive aldehydedecarbonylation. A cooperative catalysis strategy enabled intramolecular hydroacylation of disubstituted alkenes to form seven- and six-membered rings without requiring substrate-embedded chelating groups.
Organoyttrium-Catalyzed Sequential Cyclization/Silylation Reactions of Nitrogen-Heteroaromatic Dienes Demonstrating “Aryl-Directed” Regioselectivity
作者:Gary A. Molander、Monika H. Schmitt
DOI:10.1021/jo0000527
日期:2000.6.1
The reaction of 1-allyl-2-vinyl-1H-pyrroles and 1-allyl-2-vinyl-1H-indoles with arylsilanes in the presence of catalytic [Cp(TMS)(2)Y(&mgr;-Me)](2) leads to highly selective cyclization/silylation events. In this process the active catalyst for the reaction, "Cp(TMS)(2)YH", undergoes initial olefin insertion at the vinyl group. Even isopropenyl substituents on the heteroaromatics react in preference
Reaction of cobalt porphyrins with aldehydes in the presence of t-butyl hydroperoxide
作者:Jun-ya Watanabe、Jun-ichiro Setsune
DOI:10.1016/s0022-328x(98)00921-8
日期:1999.2
formed exclusively by using t-butyl hydroperoxide instead of NaBH4 and air. Thus, various σ-(acyl)CoIII porphyrins were produced in good yields by way of generation of a t-butoxyl radical, hydrogen abstraction from aldehyde, and coupling of an acylradical and CoII porphyrin. This reaction was applied to acylradical cyclization of 2-allyloxy-1-naphthaldehyde, 2-allyloxybenzaldehyde, 2-allylbenzaldehyde
Enantioselective Synthesis of Polycyclic Nitrogen Heterocycles by Rh-Catalyzed Alkene Hydroacylation: Constructing Six-Membered Rings in the Absence of Chelation Assistance
作者:Xiang-Wei Du、Avipsa Ghosh、Levi M. Stanley
DOI:10.1021/ol501869s
日期:2014.8.1
Catalytic, enantioselective hydroacylations of N-allylindole-2-carboxaldehydes and N-allylpyrrole-2-carboxaldehydes are reported. In contrast to many alkene hydroacylations that form six-membered rings, these annulative processes occur in the absence of ancillary functionality to stabilize the acylrhodium(III) hydrideintermediate. The intramolecular hydroacylation reactions generate 7,8-dihydropyrido[1
报道了N-烯丙基吲哚-2-甲醛和N-烯丙基吡咯-2-甲醛的催化对映选择性加氢酰化。与形成六元环的许多烯烃加氢酰化相反,这些环化过程是在不存在稳定酰基铑(III)氢化物中间体的辅助官能团的情况下发生的。分子内加氢酰化反应以中等至高产率生成具有优异对映选择性的7,8-二氢吡啶并[1,2- a ]吲哚-9(6 H )-酮和 6,7-二氢吲哚嗪-8(5 H )-酮。