An organocatalyzed one-pot Michael addition-Pictet–Spengler sequence of β-ketoamides and α,β-unsaturated aldehydes was developed, which provided access to highly substituted indolo[2,3-α]quinolizidines and benzo[α]quinolizidines in moderate to good yields and good to excellent enantioselectivities. For aromatic α,β-unsaturated aldehydes 1a–j products 10a–r containing a stable enol configuration were
as a mixture of keto and enol tautomers. Such tautomeric pairs were transformed into stable compounds with an E-ethylidenyl group in telescoped steps. This method was successfully applied in the synthesis of epi-geissoschizol. Michael addition - organocatalysis - cyclization - enantioselectivity - reduction
开发了一种利用β-酮酰胺和脂肪族α,β-不饱和醛的有机催化一锅迈克尔加成反应和Pictet-Spengler序列,从而提供了以酮基和烯醇的混合物形式高取代度的吲哚[2,3- a ]喹喔啉类化合物的途径。互变异构体。在伸缩步骤中,将这样的互变异构对转化为具有E-亚乙基的稳定化合物。该方法已成功地应用于表位-geissoschizol的合成。 迈克尔加成-有机催化-环化-对映选择性-还原
10.1021/acs.joc.4c00833
作者:Oyejobi, Aanuoluwapo O.、Huang, Jie、Luo, Yun-Xuan、Tang, Xiang-Ying、Wang, Long
DOI:10.1021/acs.joc.4c00833
日期:——
The incorporation of oxygen atoms from air under aerobic conditions plays an important role in organic synthesis. Herein, Brønsted acids are found to be a two-in-one strategic catalyst to transform enamines from β-oxoamides and amines to pyrrolin-4-ones without an external photocatalyst under visible-light conditions. The Brønsted acid can inhibit the C–C bond fragmentation of the [2 + 2] adduct from
在有氧条件下从空气中引入氧原子在有机合成中起着重要作用。在此,布朗斯台德酸被发现是一种二合一的战略催化剂,在可见光条件下无需外部光催化剂即可将烯胺从β-氧代酰胺和胺转化为吡咯啉-4-酮。布朗斯台德酸可以抑制烯胺和1 O 2生成的[2 + 2]加合物的 C-C 键断裂,但最重要的是,它可以通过酸变色作用与烯胺和吡咯啉-4-酮产物形成光敏剂,促进1 O 2代。
Syntheses and antibacterial activity of some new N-(3-methyl-2-quinoxaloyl) amino alcohols and amine 1,4-dioxides
作者:Salim S. Sabri、Mustafa M. El-Abadelah、Wajih M. Owais
DOI:10.1021/je00036a039
日期:1984.4
Wilkins, David J.; Jackson, Anthony H.; Shannon, Patrick V. R., Journal of the Chemical Society. Perkin transactions I, 1994, # 3, p. 299 - 308
作者:Wilkins, David J.、Jackson, Anthony H.、Shannon, Patrick V. R.