A novel and convenient strategy for the synthesis of phthalazines from an aryne precursor
作者:Hassen Bel Abed、Omprakash Bande、Oscar Mammoliti、Guy Van Lommen、Piet Herdewijn
DOI:10.1016/j.tetlet.2013.10.075
日期:2013.12
A novel three-step entry toward phthalazine derivatives has been elaborated. A strategy based on a sequential acyl-alkylation/diazo transfer reaction/Diaza-Wittig reaction led to the desired analogues in moderate to good yields from an aryne precursor. Various aryl groups were introduced on the annulated pyridazine, moreover the presence of an ester group allows further modifications.
Construction of Oxo-Bridged Diazocines via Rhodium-Catalyzed (4+3) Cycloaddition of Carbonyl Ylides with Azoalkenes
作者:Qiwen Pang、Jin Zhou、Yuling Wu、Wu-Jingyun Zhou、Wei-Fang Zuo、Gu Zhan、Bo Han
DOI:10.1021/acs.orglett.2c00076
日期:2022.2.18
accessibility. This work describes the catalytic (4+3) cycloaddition reaction of carbonyl ylides with azoalkenes generated in situ. The rhodium-catalyzedcascadereaction features good atom and step economy, providing the first access to oxo-bridged diazocines. The product could be synthesized on a gram scale and converted into diversely substituted dihydroisobenzofurans.
Cooperative Catalysis for the Highly Diastereo‐ and Enantioselective [4+3]‐Cycloannulation of
<i>ortho</i>
‐Quinone Methides and Carbonyl Ylides
作者:Arun Suneja、Henning Jakob Loui、Christoph Schneider
DOI:10.1002/anie.201913603
日期:2020.3.27
We describe herein a highly diastereo- and enantioselective [4+3]-cycloannulation of ortho-quinone methides and carbonyl ylides to furnish functionalized oxa-bridged dibenzooxacines with excellent yields and stereoselectivity in a single synthetic step. The combination of rhodium and chiral phosphoric acid catalysis working in concert to generate both transient intermediates in situ provides direct