ONE-POT OXIDATION OF AZOMETHINE COMPOUNDS INTO ARENECARBOXYLIC ACIDS
摘要:
Aromatic azomethine compounds, such as aldazines 1, aldoximes 7 and tosylhydrazones 8 oxidized with 30% hydrogen peroxide in the presence of poly(bis-1,2-phenylene) diselenide (6) as catalyst produce arenecarboxylic acids 2 mostly in high to excellent yields. The presented one-pot procedure has a synthetic value.
A Facile Method for the Conversion of Oximes and Tosylhydrazones to Carbonyl Compounds with Dess-Martin Periodinane
作者:D. Subhas Bose、A. Venkat Narsaiah
DOI:10.1080/00397919908086055
日期:1999.3
Abstract A convenient method for the direct conversion of oximes and tosylhydrazones to carbonylcompounds upon treatment with Dess-Martin periodinane/sodium acetate in CH2CI2 is described.
In this study, sulfones are synthesized from sulfonylhydrazones catalyzed by iron(III) phthalocyanine chloride. This reaction offers broad substrate scope, occurs under mild conditions, utilized readily available reactants, and forms products in good-to-high yields. Crossover experiments reveal that the reaction occurs via an intramolecular process, which is possibly different from other studies reported
Selective hydrolysis of phosphorus(<scp>v</scp>) compounds to form organophosphorus monoacids
作者:Jeffrey Ash、Hai Huang、Paula Cordero、Jun Yong Kang
DOI:10.1039/d1ob00881a
日期:——
phosphinic, and phosphoric monoacids has been developed. Inert pentavalent P(V)-compounds (phosphonate, phosphinate, and phosphate) are activated by triflateanhydride (Tf2O)/pyridine system to form a highly reactive phosphoryl pyridinium intermediate that undergoes nucleophilic substitution with H2O to selectively deprotect one alkoxy group and form organophosphorus monoacids.
已经开发了一种用于合成难以捉摸的膦酸、次膦酸和磷酸单酸的无叠氮化物和过渡金属的方法。惰性五价 P( V )-化合物(膦酸盐、次膦酸盐和磷酸盐)被三氟甲磺酸酐 (Tf 2 O)/吡啶体系活化,形成高反应性磷酰吡啶鎓中间体,该中间体经过 H 2 O 的亲核取代以选择性脱保护一个烷氧基基团形成有机磷单酸。
Pd-Catalyzed Carbonylation of Diazo Compounds at Atmospheric Pressure: A Catalytic Approach to Ketenes
作者:Zhenhua Zhang、Yiyang Liu、Lin Ling、Yuxue Li、Yian Dong、Mingxing Gong、Xiaokun Zhao、Yan Zhang、Jianbo Wang
DOI:10.1021/ja107351d
日期:2011.3.30
and affects the diastereoselectivity of the β-lactam products by assisting isomerization of the addition intermediate. On the other hand, the acylketenes generatedfrom the Pd-catalyzed carbonylation of α-diazoketones react with imines in a formal [4 + 2] cycloaddition manner to afford 1,3-dioxin-4-one derivatives. This straightforward carbonylation provides a new approach toward highly efficient catalytic
A simple and efficient method for the synthesis of pyrazole-fused porphyrins from readily available N-tosylhydrazones and 2-nitroporphyrins has been developed. This catalyst-free method can be applied to a wide range of substrates and demonstrate excellent tolerance to a variety of substituents.