Catalytic chemoselective [3+3] cycloadditions of azomethine ylides with quinone monoimides leading to the construction of a dihydrobenzoxazine scaffold
作者:Cong-Shuai Wang、Ren-Yi Zhu、Yu-Chen Zhang、Feng Shi
DOI:10.1039/c5cc03341a
日期:——
A chemoselective [3+3] cycloaddition of in situ generated azomethine ylides with quinone monoimides has been established, which efficiently led to the construction of dihydrobenzoxazine frameworks with biological relevance.
Iridium-Catalyzed Diastereo- and Enantioselective [4 + 3] Cycloaddition of 4-Indolyl Allylic Alcohols with Azomethine Ylides
作者:Wu-Lin Yang、Tao Ni、Wei-Ping Deng
DOI:10.1021/acs.orglett.0c04132
日期:2021.1.15
[4 + 3] cycloaddition of racemic 4-indolyl allylic alcohols with azomethineylides is reported. The ability of acid promoter zinc triflate to perform multiple roles is the key factor for the success of this strategy. This method provides scalable and efficient access to biologically important azepino[3,4,5-cd] indoles in good yields with generally excellent diastereo- and enantioselectivities (up to
据报道空前的铱催化的外消旋4-吲哚基烯丙基醇与偶氮甲碱的不对称[4 + 3]环加成反应。酸促进剂三氟甲磺酸锌发挥多种作用的能力是该策略成功的关键因素。该方法可提供具有高收率的生物学上重要的azepino [3,4,5- cd ]吲哚的可扩展且有效的途径,通常具有出色的非对映和对映选择性(高达> 20:1 dr和> 99%ee)。温和的反应条件,易于接近的底物和手性催化剂以及广泛的底物范围突出了该方法的实用性。
Iridium-Catalyzed Asymmetric Cascade Allylation/Pictet–Spengler Cyclization Reaction for the Enantioselective Synthesis of 1,3,4-Trisubstituted Tetrahydroisoquinolines
作者:Wu-Lin Yang、Tian-Tian Liu、Tao Ni、Bin Zhu、Xiaoyan Luo、Wei-Ping Deng
DOI:10.1021/acs.orglett.1c00709
日期:2021.4.2
An iridium-catalyzed trifluoroacetic acid-promoted asymmetric cascade allylation/Pictet–Spengler cyclization reaction of azomethine ylides with aromatic allylic alcohols is reported. This protocol provides a facile and scalable method for the construction of 1,3,4-trisubstituted tetrahydroisoquinolines containing two stereogenic centers in good yields (up to 96%) with generally excellent diastereo-
Brønsted Acid-Catalyzed Three-Component 1,3-Dipolar Cycloadditions of 1,2-Disubstituted Alkynes with Aldehyde-Generated Azomethine Ylides
作者:Wei Tan、Bai-Xiang Du、Lu Guo、Mei Li、Gui-Juan Xing、Feng Shi
DOI:10.1002/jhet.2111
日期:2015.7
The first 1,3‐dipolarcycloadditions (1,3‐DCs) of 1,2‐disubstituted alkynes with aldehyde‐generatedazomethineylides have been established, leading to the efficient synthesis of poly‐substituted 2,5‐dihydropyrroles.The Brønsted acid‐catalyzed three‐component 1,3‐DCs of but‐2‐ynedioates, aldehydes, and diethyl 2‐aminomalonate tolerate a wide range of substrates, offering structurally diverse poly‐substituted
作者:Xi Yuan、Xudong Wu、Pengxiang Zhang、Fei Peng、Can Liu、Haijun Yang、Changjin Zhu、Hua Fu
DOI:10.1021/acs.orglett.8b04012
日期:2019.4.19
Efficient axially chiral cyclic phosphoricacidcatalyzedenantioselective sequential additions of 2-aryl-3H-indol-3-ones, aldehydes, and diethyl 2-aminomalonate have been developed, and a new type of nitrogen-containing heterocyclic compounds, 2,3-dihydro-1H-imidazo[1,5-a]indol-9(9aH)-one derivatives, were prepared in good yields and excellent ee values with a wide functional group tolerance, in which
已经开发出有效的轴向手性环状磷酸催化2-芳基-3 H-吲哚-3-酮,醛和2-氨基丙二酸二乙酯的对映选择性顺序添加,并开发了一种新型的含氮杂环化合物2,3-以良好的收率和优异的ee值制备了二氢-1 H-咪唑并[1,5- a ]吲哚-9(9a H)-one衍生物,具有宽泛的官能团耐受性,其中底物的反应性和对映选择性为由我们新开发的轴向手性环状磷酸(R)-CYC-9-CPA支持。此外,相应的1 H-咪唑并[1,5- a ]吲哚-9(9a H通过简单地氧化2,3-二氢-1 H-咪唑并[1,5- a ]吲哚-9(9a H)-one衍生物来构建1 )-ones。