A highly efficient method for the construction of 3a,6a-dihydrofuro[2,3-b]furan derivatives has been developed via a novel bicyclization, which is very valuable for the synthesis of fused furofuran compounds since it is time-saving and catalyst-free. Based on the bicyclization, a coupled domino strategy has been developed to directly construct 3a,6a-dihydrofuro[2,3-b]furan derivatives from methyl ketones
通过新型的双环化,已经开发出了一种高效的3a,6a-二氢呋喃[2,3- b ]呋喃衍生物的构建方法,该方法对于合成熔融呋喃呋喃化合物非常节省时间,并且可以催化催化剂。自由。基于双环化,已开发了一种耦合多米诺骨牌策略,可直接从甲基酮构建3a,6a-二氢呋喃[2,3- b ]呋喃衍生物。
Auto-tandem catalysis: synthesis of 4H-pyrido[1,2-a]pyrimidin-4-ones via copper-catalyzed aza-Michael addition–aerobic dehydrogenation–intramolecular amidation
A copper-catalyzed domino synthesis of 4H-pyrido[1,2-a]pyrimidin-4-ones has been developed from 1,4-enediones and 2-aminoheterocycles with air as the oxidant.
Phosphine-catalyzed divergent domino processes between γ-substituted allenoates and carbonyl-activated alkenes
作者:Mingyue Wu、Zhaobin Han、Huanzhen Ni、Nengzhong Wang、Kuiling Ding、Yixin Lu
DOI:10.1039/d1sc06364b
日期:——
Highly enantioselective and chemodivergent domino reactions between γ-substituted allenoates and activated alkenes have been developed.
已经开发出高度对映选择性和化学多样性的多米诺反应,该反应涉及γ取代的烯酸酯和活性烯烃之间的反应。
Organocatalytic (<i>Z</i>/<i>E</i>)-Selective Synthesis of 3-Vinylnaphthofurans via a Formal (3 + 2) Cycloaddition
作者:Lei Yu、Ran Xu、Yan-Yi Yao、Yu Lu、Fei-Yang Liu、Wei Tan、Feng Shi
DOI:10.1021/acs.joc.2c02641
日期:2023.3.17
A formal (3 + 2) cycloaddition of 1,4-enediones with 2-naphthols was established under the catalysis of trifluoromethanesulfonic acid as an organocatalyst, leading to the efficient synthesis of structurally diverse 3-vinylnaphthofurans with high yields and excellent (Z/E)-selectivities (up to 96% yield, all >20:1 Z/E). This formal (3 + 2) cycloaddition involved a cascade reaction process, and the intramolecular
在三氟甲磺酸作为有机催化剂的催化下,建立了 1,4-烯二酮与 2-萘酚的正式 (3 + 2) 环加成反应,高效合成了结构多样的 3-乙烯基萘并呋喃,收率高且性能优异 ( Z / E )-选择性(高达 96% 的产率,均 >20:1 Z / E)。这种形式的 (3 + 2) 环加成涉及级联反应过程,3-乙烯基萘并呋喃结构中的分子内氢键应该在控制 ( Z / E)-新形成的乙烯基的选择性。此外,发现这类 3-乙烯基萘并呋喃具有轴向手性。这项工作提供了一种通过级联反应构建多取代乙烯基萘并呋喃的有机催化方法,具有出色的 ( Z / E )-选择性控制,这将成为通过原位构建呋喃核和形成乙烯基。
Paal; Schneider, Chemische Berichte, 1886, vol. 19, p. 3158