Attempts were made to prepare novel 7-alkoxycarbonyl-7,8,8-tricyanoquinodimethanes (ethoxy(5a), isopropoxy(5b), and tert-butoxy(6c)), 7,7-bis(alkoxycarbonyl)-8,8-dicyanoquinodimethanes (ethoxy(6a), isopropoxy(6b), and tert-butoxy(6c)), and 1-(2,2-dimethyl-1,3-dioxane-4,6-dione-5-ylidene)-4-(dicyanomethylene)-2,5-cyclohexadiene(6d). 5c and 6d were obtained as yellow and orange needles, respectively
Modular Synthesis of Polar Spirocyclic Scaffolds Enabled by Radical Chemistry
作者:Khadijah Anwar、Francisco José Aguilar Troyano、Ayham H. Abazid、Oumayma El Yarroudi、Ignacio Funes-Ardoiz、Adrián Gómez-Suárez
DOI:10.1021/acs.orglett.3c00869
日期:2023.5.12
Herein, we report a highly modular strategy to access spirocyclic scaffolds from abundant starting materials, i.e., cyclic ketones and α-amino or oxamic acids. The sequence proceeds through a straightforward Knoevenagel condensation, followed by a domino Giese-type reaction/base-mediated cyclization process, to deliver a broad scope of polar spirocyclic scaffolds in good to excellent yields. The products
Diastereoselective Synthesis of Bicyclo[3.2.1]octanes via Catalyst‐Free Cascade Michael/Henry Reaction with a Functionalized Vinylogous Nucleophile
作者:Laiyu An、Linghong Chen、Hongzhou Yang、Ling Ye、Hongjun Yang、Xinying Li、Zhigang Zhao、Xuefeng Li
DOI:10.1002/adsc.202300427
日期:2023.9.5
A readily prepared and functionalized vinylogous nucleophile has been explored and utilized to construct bridged bicyclic compounds. The corresponding cascadeMichael/Henry reaction occurred with relatively high reactivity under catalyst-free and mild conditions. A range of structurally distinct bicyclo[3.2.1]octanes were generated in 40–96% isolated yields with excellent diastereoselectivities (≥10:1