Phosphine-catalyzed sequential (2+3)/(2+4) annulation of γ-vinyl allenoates: access to the synthesis of chromeno[4,3-<i>b</i>]pyrroles
作者:Xiaohu Li、You Huang
DOI:10.1039/d1cc04199a
日期:——
A phosphine-catalyzed cascade (2+3)/(2+4) cyclization reaction of γ-vinyl allenoates with aldimine esters has been developed to provide a series of chromeno[4,3-b]pyrrole derivatives that contain three contiguous stereogenic centers. The method gives a good yield, excellent chemoselectivity and diastereoselectivity under mild conditions.
已开发出膦催化的 γ-烯丙酸乙烯酯与醛亚胺酯的级联 (2+3)/(2+4) 环化反应,以提供一系列包含三个连续立体中心的色基[4,3- b ] 吡咯衍生物. 该方法在温和条件下具有良好的收率、优异的化学选择性和非对映选择性。
Phosphine-Catalyzed (3 + 2)/(3 + 2) Sequential Annulation of γ-Vinyl Allenoates: Access to Fused Carbocycles
作者:Jiaxu Feng、Yingying Chen、Wenhui Qin、You Huang
DOI:10.1021/acs.orglett.9b04176
日期:2020.1.17
The first (3 + 2)/(3 + 2) sequential annulation of γ-vinyl allenoates with alkylidenemalononitriles enabled by phosphine catalysis has been reported. A broad range of structurally dense tetra- and penta-substituted bicyclic[3,3,0]octene derivatives, containing a quaternary center and three sequential stereogenic center, were synthesized in good to excellent yields. In this approach, three new C-C bonds
Phosphine-Catalyzed Domino Annulation of γ-Vinyl Allenoates: Synthesis of Tetrahydrofuro[3,2-c]quinoline Derivatives
作者:Mengmeng Ma、Jiaxu Feng、Wei Cai、You Huang
DOI:10.1021/acs.orglett.4c00656
日期:2024.5.17
A novel phosphine-catalyzed domino annulation reaction of γ-vinyl allenoates and o-aminotrifluoacetophenones for the construction of terahydrofuro[3,2-c]quinolinederivatives has been developed. In this domino reaction, two kinds of terahydrofuro[3,2-c]quinoline compounds containing CF3 groups were obtained with good yields under mild conditions, three new C–N, C–C, and C–O bonds can be built in one
开发了一种新型膦催化的γ-乙烯基联烯酸酯和邻氨基三氟苯乙酮的多米诺环化反应,用于构建四氢呋喃并[3,2- c ]喹啉衍生物。在该多米诺骨牌反应中,在温和的条件下以良好的产率得到了两种含有CF 3基团的四氢呋喃并[3,2- c ]喹啉化合物,并且可以构建三个新的C-N、C-C和C-O键。一步,通过调节反应条件实现反应选择性。此外,对该反应的不对称变体的初步研究以中等对映选择性进行。
One‐Pot Synthesis of 2,3,6‐Trisubstituted Pyridines by Phosphine‐Catalyzed Annulation of γ‐Vinyl Allenoates with Enamino Esters Followed by DDQ‐Promoted Oxidative Aromatization
作者:Xiaohu Li、Wei Cai、You Huang
DOI:10.1002/adsc.202200071
日期:2022.6.7
AbstractA one‐pot strategy for constructing trisubstituted pyridine derivatives had been established via phosphine‐catalyzed annulation and DDQ oxidative aromatization reactions. This protocol provides trisubstituted pyridines from γ‐vinyl allenoates and enamino esters under metal‐free conditions.magnified image