Synthesis of Unsymmetrically Substituted 1,3-Butadiynes and 1,3,5-Hexatriynes via Alkylidene Carbenoid Rearrangements
作者:Annabelle L. K. Shi Shun、Erin T. Chernick、Sara Eisler、Rik R. Tykwinski
DOI:10.1021/jo026481h
日期:2003.2.1
Unsymmetrically substituted 1,3-butadiynes and 1,3,5-hexatriynes are synthesized in four steps from commercially available aldehydes or carboxylic acids. The key step in this process involves a Fritsch-Buttenberg-Wiechell rearrangement, in which an alkylidene carbenoid intermediate subsequently rearranges to the desired polyyne. This rearrangement proceeds under mild conditions, and it is tolerant
Utility of the Tandem Pauson−Khand Reaction in the Construction of Tetracycles
作者:Scott G. Van Ornum、Michelle M. Bruendl、Hui Cao、Mundala Reddy、Desiree S. Grubisha、Dennis W. Bennett、James M. Cook
DOI:10.1021/jo9914014
日期:2000.4.1
constituting up to 98% yield for each carbon-carbon bond so formed. Furthermore, tetracyclic [5.6.6.5] systems such as dicyclopenta[b,g]decalins 37, 38, and 40 were prepared from similar diene-diyne precursors via the tandem Pauson-Khand cyclization. Importantly, acetal 36 provided the desired cis-fused [5.6.6.5] system 38a (via 40a/b) in stereospecific fashion. This reaction is unique in that it provides
Asymmetric Synthesis of Less Accessible α-Tertiary Amines from Alkynyl <i>Z-</i>
Ketimines
作者:Taichi Kano、Yusuke Aota、Keiji Maruoka
DOI:10.1002/anie.201710084
日期:2017.12.18
highly stereoselective synthesis of hitherto less accessible chiral α‐tertiary amines with multiple structurally similar linear carbon chains was achieved through chiral auxiliary mediated addition of organolithium reagents to the geometrically well‐controlled alkynyl Z‐ketimines. This stereoselective nucleophilic addition offers a general approach to the asymmetric synthesis of nitrogen‐containing
Preparation of unsymmetrical dialkenyl ketones from the reactions of alkenyl alkynyl ketones with Gilman reagents
作者:Phil Ho Lee、Jaekeun Park、Kooyeon Lee、Hyoung-Chun Kim
DOI:10.1016/s0040-4039(99)01490-2
日期:1999.9
Unsymmetrical dialkenyl ketones were prepared from the reactions of alkenyl alkynyl ketones with 0.55 equiv of lithium dialkylcuprates.
不对称的二烯基酮是由烯基炔基酮与0.55当量的二烷基铜酸锂反应制得的。
Reactions of 5-(Trialkyl)silylpent-1-en-4-yn-3-ones with Hydrazines: Original Synthetic Routes to Luminescent Substances Containing Azole Motifs
作者:Alexander A. Golovanov、Ivan S. Odin、Kareem V. Gordon、Radik N. Itakhunov、Dmitry M. Gusev、Sergey A. Sokov、Anna V. Vologzhanina、Stanislav A. Grabovskiy、Ilya M. Sosnin、Anton I. Ukolov、Olga I. Orlova、Vladimir A. Lazarenko、Pavel V. Dorovatovskii、Darina D. Darmoroz、Anastasiia O. Piven、Tetiana Orlova
DOI:10.1055/s-0043-1763601
日期:2024.1
isoxazoles, thiophenes, thiazoles, benzo[d]thiazoles, and benzo[d]imidazoles. In reactions with hydrazine and its monosubstitutedaromatic and heteroaromatic derivatives, the mentioned pent-1-en-4-yn-3-ones, containing Me3Si, Et3Si, and t-BuMe2Si groups at the triple bond, give 3-(trialkylsilyl)ethynylpyrazolines. Following stages of desilylation and 1,3-dipolar cycloaddition with nitrile oxides, the 3-(tr