A novel and convenient method has been developed for the facile synthesis of functionalized succinimide derivatives via intramolecular Alder-ene reaction of 1,6-enynes. This reaction features mild and metal-free reaction conditions, which offers a green and efficient entry to synthetically important succinimide scaffolds. Preliminary mechanistic studies suggest that a diradical intermediate might be
efficient approach for the synthesis of fluorescent 2,3-naphthalimide derivatives has been developed from readily available starting materials via an intramolecular didehydro-Diels–Alder reaction, which proceeded well under room temperature, exhibiting a wide substrate scope and good functional group tolerance. The practicability of this methodology has been verified by one-step synthesis of the environmentally
Substrate‐Assisted, Transition‐Metal‐Free Diboration of Alkynamides with Mixed Diboron: Regio‐ and Stereoselective Access to
<i>trans</i>
‐1,2‐Vinyldiboronates
作者:Astha Verma、Russell F. Snead、Yumin Dai、Carla Slebodnick、Yinuo Yang、Haizhu Yu、Fu Yao、Webster L. Santos
DOI:10.1002/anie.201700946
日期:2017.4.24
A substrate‐assisteddiboration of alkynamides using the unsymmetrical pinacolato‐1,8‐diaminonaphthalenato diboron (pinBBdan) is described. The transition‐metal‐free reaction proceeds in a regio‐ and stereoselective fashion to exclusively afford trans‐vinyldiboronates in good to excellent yields. Notably, Bdan and Bpin are installed on the α‐ and β‐carbon atoms, respectively.
<i>trans</i>-Hydroboration of Propiolamides: Access to Primary and Secondary (<i>E</i>)-β-Borylacrylamides
作者:R. Justin Grams、Russell G. Fritzemeier、Carla Slebodnick、Webster L. Santos
DOI:10.1021/acs.orglett.9b02408
日期:2019.9.6
A base-mediated trans-hydroboration of propiolamides that provides access to previously elusive primary and secondary (E)-β-borylacrylamide products has been developed. In the presence of n-butyllithium and pinacolborane, complete regioselectivity and stereoselectivity is observed, affording the corresponding vinylboronate products in up to 91% yield. A wide variety of primary and secondary amides
Methyl-triflate-mediated dearylmethylation of <i>N</i>-(arylmethyl)carboxamides <i>via</i> the retro-Mannich reaction induced by electrophilic dearomatization/rearomatization in an aqueous medium at room temperature
Dearylmethylation of N-(arylmethyl)carboxamides was achieved under metal-free conditions in an aqueous medium induced by electrophilic dearomatization/rearomatization.