Chemodivergent Spirocyclization of 2‐Sec‐Aminobenzilidene Imidazolones: Lewis Versus Brønsted Acids Catalysis
作者:Dmitrii S. Ivanov、Elvira R. Zaitseva、Alexander Yu. Smirnov、Dina A. Rustamova、Andrey A. Mikhaylov、Maria A. Sycheva、Darya A. Gluschenko、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1002/adsc.202200109
日期:2022.4.26
Benzylidene imidazolones with ortho- secondary aminogroup undergo acid-promoted chemodivergent spirocyclization. Strong Lewisacids provide access to spirocyclic tetrahydroquinolines via [1,5]-hydride shift triggered cyclization despite of the presence of free secondary amino group. Brønstedacids promote unprecedented intramolecular umpolung hydroamination reaction with the formation of spirocyclic indolines
isolated from traditional African herbal medicine Cryptolepis sanguinolenta, and its broad spectrum of biological activities has been illuminated in past decades. In this study, neocryptolepine and its derivatives (1-49) were designed and synthesized from economical and readily available starting materials. Their structures were confirmed by protonnuclearmagneticresonance, carbon nuclearmagnetic resonance
Synthesis of 5,11-dialkyl-5,6,11,12-tetrahydro-6,12-epoxydibenzo[b,f][1,5]diazocines from 2-alkylaminobenzaldehydes
作者:Dmitry S. Ivanov、Elvira R. Zaitseva、Alexander Yu. Smirnov、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1007/s10593-022-03097-4
日期:2022.7
A simple methodology was developed for the synthesis of 5,11-dialkyl-5,6,11,12-tetrahydro-6,12-epoxydibenzo[b,f][1,5]diazocines by treatment of the respective 2-alkylaminobenzaldehydes with hydrogen chloride solution in dioxane at room temperature.
开发了一种简单的方法来合成 5,11-dialkyl-5,6,11,12-tetrahydro-6,12-epoxydibenzo[ b , f ][1,5] dizocines 分别用 2-烷基氨基苯甲醛处理室温下的二恶烷中的氯化氢溶液。