在串联N-酰化/分子内[4 + 2]环加成反应中,使用马来酸,焦油酸和柠康酸酐以及呋喃基丙烯酰基,研究了糠醛胺的乙烯基化合物,可从呋喃丙烯醛(3-(呋喃基)烯丙胺)分两步轻松获得。和肉桂酰氯。通过在温和的条件下使用3-(呋喃基)烯丙胺和α,β-不饱和酸酐的多米诺反应,可以有效地合成各种六氢-4 H-呋喃[2,3- f ]异吲哚及其羧基衍生物。多米诺序列包括三个步骤:3-(呋喃基)烯丙胺中氮原子的酰化,分子内Diels-Alder环加成反应生成的N-酰基乙烯基呋喃(IMDAV反应),加合物发生质子转移,然后恢复呋喃核的芳香性。关键步骤,IMDAV反应,非对映选择性地产生目标产物呋喃[2,3- f ]异吲哚,并具有相对较高的收率。
在串联N-酰化/分子内[4 + 2]环加成反应中,使用马来酸,焦油酸和柠康酸酐以及呋喃基丙烯酰基,研究了糠醛胺的乙烯基化合物,可从呋喃丙烯醛(3-(呋喃基)烯丙胺)分两步轻松获得。和肉桂酰氯。通过在温和的条件下使用3-(呋喃基)烯丙胺和α,β-不饱和酸酐的多米诺反应,可以有效地合成各种六氢-4 H-呋喃[2,3- f ]异吲哚及其羧基衍生物。多米诺序列包括三个步骤:3-(呋喃基)烯丙胺中氮原子的酰化,分子内Diels-Alder环加成反应生成的N-酰基乙烯基呋喃(IMDAV反应),加合物发生质子转移,然后恢复呋喃核的芳香性。关键步骤,IMDAV反应,非对映选择性地产生目标产物呋喃[2,3- f ]异吲哚,并具有相对较高的收率。
The development of catalysts based on earth abundant metals in place of noble metals is becoming a central topic of catalysis. We herein report a cobalt/tetraphosphine complex catalyzed homogeneous hydrogenation of polar unsaturated compounds using an air- and moisture-stable and scalable precatalyst. By activation with potassium hydroxide, this cobalt system shows both high efficiency (up to 24000
N-Heterocyclic Carbene and Brønsted Acid Cooperative Catalysis: Asymmetric Synthesis of <i>trans</i>-γ-Lactams
作者:Xiaodan Zhao、Daniel A. DiRocco、Tomislav Rovis
DOI:10.1021/ja205714g
日期:2011.8.17
An efficient enantioselective approach to form trans-γ-lactams in up to 99% yield, 93% ee, and >20/1 dr using unactivated imines has been developed. The cyclohexyl-substituted azolium and the weak base sodium o-chlorobenzoate are most suitable for this transformation. Notably, the process involves cooperativecatalysis by an N-heterocycliccarbene and a Brønsted acid.
已经开发出一种使用未活化亚胺以高达 99% 的产率、93% 的 ee 和 >20/1 dr 的高效对映选择性方法形成反式-γ-内酰胺。环己基取代的唑鎓和弱碱邻氯苯甲酸钠最适合这种转化。值得注意的是,该过程涉及 N-杂环卡宾和布朗斯台德酸的协同催化。
1-Azadienes as bridging ligands in nickel(0) complexes of the type [(1-aza-1.3-diene)Ni(L)]2 (L=1-aza-1.3-diene, alkyne, triphenylphosphine)
作者:Dirk Walther、Christine Fugger、Helmar Görls
DOI:10.1016/s0022-328x(99)00654-3
日期:2000.3
Dinuclear nickel(0) complexes of the type [(R1CHCHCHNR2)2Ni]2 have been prepared from 1-aza-1.3-dienes and (cod)2Ni. Reactions of both [Ni(A)2]2 (1) and [Ni(B)2]2 (2) (A: 1-aza-1.3-diene with R1=2-furyl, R2=phenyl; in B: R1=2-furyl, R2=furfuryl) with Ph3P result in the formation of the complexes [Ni(A)(PPh3)]2 (3) and [Ni(B)(PPh3)]2 (4). According to the X-ray analyses, 1, 3 and 4 contain two
Rudtschenko, Zhurnal Obshchei Khimii, 1940, vol. 10, p. 1953,1954
作者:Rudtschenko
DOI:——
日期:——
Easy construction of furo[2,3-f]isoindole core by the IMDAV reaction between 3-(furyl)allylamines and α,β-unsaturated acid anhydrides
作者:Fedor I. Zubkov、Vladimir P. Zaytsev、Dmitriy F. Mertsalov、Eugenia V. Nikitina、Yuriy I. Horak、Roman Z. Lytvyn、Yuriy V. Homza、Mykola D. Obushak、Pavel V. Dorovatovskii、Victor N. Khrustalev、Alexey V. Varlamov
DOI:10.1016/j.tet.2016.03.023
日期:2016.5
The vinylogues of furfurylamines, easily available in two steps from furylacroleins (3-(furyl)allylamines), were studied in a tandem N-acylation/intramolecular [4+2] cycloaddition with maleic, pyrocinchonic, and citraconic anhydrides, as well as furylacryloyl and cinnamoyl chlorides. By using a domino reaction of 3-(furyl)allylamines and α,β-unsaturated acid anhydrides under mild conditions, various
在串联N-酰化/分子内[4 + 2]环加成反应中,使用马来酸,焦油酸和柠康酸酐以及呋喃基丙烯酰基,研究了糠醛胺的乙烯基化合物,可从呋喃丙烯醛(3-(呋喃基)烯丙胺)分两步轻松获得。和肉桂酰氯。通过在温和的条件下使用3-(呋喃基)烯丙胺和α,β-不饱和酸酐的多米诺反应,可以有效地合成各种六氢-4 H-呋喃[2,3- f ]异吲哚及其羧基衍生物。多米诺序列包括三个步骤:3-(呋喃基)烯丙胺中氮原子的酰化,分子内Diels-Alder环加成反应生成的N-酰基乙烯基呋喃(IMDAV反应),加合物发生质子转移,然后恢复呋喃核的芳香性。关键步骤,IMDAV反应,非对映选择性地产生目标产物呋喃[2,3- f ]异吲哚,并具有相对较高的收率。