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。
Transposition of Aromaticity from a Furan to a Cyclohexane Ring in Furoisoindoles During the Interaction of 3-(Furyl)allylamines with Bromomaleic Anhydride
作者:Kseniia A. Alekseeva、Elizaveta A. Kvyatkovskaya、Eugeniya V. Nikitina、Vladimir P. Zaytsev、Svetlana M. Eroshkina、Khidmet S. Shikhaliev、Hieu H. Truong、Victor N. Khrustalev、Fedor I. Zubkov
DOI:10.1055/s-0039-1690782
日期:2020.2
investigation of the interaction between 3-(furan-2-yl)allylamines and bromomaleic anhydride. This conversion begins with the initial N-acylation of the allylamines by the anhydride, followed by intramolecular Diels–Alder reaction, which is accompanied by a dehydrohalogenation, and ends with the formation of partially unsaturated furo[2,3-f]isoindoles followed by transposition of aromaticity from the furan moiety
building on reductive coupling is a powerful method for the preparation of organic compounds. The identification of environmentally benign reductants is key for establishing an efficientreductive coupling reaction. Herein an efficient strategy enabling H2 as the sole reductant for the palladium-catalyzed allyl–allyl reductive coupling reaction is described. A wide range of allylamines and allylic alcohols
reaction of 3-(alk-2-enyl)benzylamino-2-(methoxycarbonyl)acrolein derivatives 3 gave 4,5-dihydro-1H-azepines 4 stereoselectively in good yields via an intramolecular carbonyl-ene reaction. Conjugated diene compounds 10 from acroleins 3 also underwent olefin-ene reaction to give azepine derivatives 11. In these azepine-ring formation, the methoxycarbonylgroup at the 2-position in 3 facilitated the progress
Sequential Intramolecular Diels–Alder Reaction of 3‐Heteroaryl‐2‐propenylamides of Ethenetricarboxylate
作者:Hirotaka Sugiura、Shoko Yamazaki、Akiya Ogawa
DOI:10.1002/jhet.3665
日期:2019.9
of amide/[4 + 2] cycloaddition/hydrogen‐shiftreactions proceed sequentially. The observed stereoselectivity of the fused rings has been investigated by the density functional theory calculations. The reaction of 1,1,2‐ethenetricarboxylic acid 1,1‐diethyl ester with 3‐(3‐pyridinyl)‐2‐propen‐1‐amine under the amide condensation conditions afforded HOBt‐incorporated 3,4‐trans‐pyrrolidine selectively.
Effects of Catalyst Activation and Ligand Steric Properties on the Enantioselective Allylation of Amines and Phenoxides
作者:Andreas Leitner、Chutian Shu、John F. Hartwig
DOI:10.1021/ol050029d
日期:2005.3.1
The yields, enantioselectivities, and regioselectivities of the reactions of amines and phenoxides with allylic carbonates in the presence of a metallacyclic iridium catalyst were compared. These data show that both preactivation of the catalyst and the size of the ligand affect the yield, enantioselectivity, and regioselectivity. With the activated catalyst containing a bis-naphthethylamino group, the allylic amination and etherification of a broad range of allylic carbonates occurred in high yields and with high regioselectivities and enantioselectivities.