Claisen-Schmidt, aza-Michael, cyclization via cascade strategy toward microwave promoted synthesis of imidazo[2,1-b]quinazolines
作者:Duraipandi Devi Priya、Selvaraj Mohana Roopan
DOI:10.1080/00397911.2020.1757112
日期:2020.6.17
Imidazole blended quinazolines are having a wide run of potential applications in synthetic field. In this current investigation, we reported a modern synthesis with the help of non-conventional energy. Optimization parameters have been stabilized utilizing RSM (Response Surface Method) as well as Taguchi models. The yield obtained from the proposed protocol is significantly higher compared to other routine strategies. The products were explored by implies of H-1, C-13-NMR and HR-MS investigation. Interestingly, cyclization & aromatization has been influenced by KOH in a greater extent. It is critical that the imidazo[1,2-b]quinazolines show intense fluorescence emission, significant stokes shift, and high quantum yield.
INDENO[1,2-c], NAPHTHO[1,2-c]- AND BENZO[6,7]CYCLOHEPTA[1,2-c]PYRAZOLE DERIVATIVES
申请人:ABBOTT GmbH & Co. KG
公开号:EP1023063B1
公开(公告)日:2003-09-10
Synthesis of Benzo[<i>c</i>]xanthones from 2-Benzylidene-1-tetralones by the Ultraviolet Radiation-Mediated Tandem Reaction
作者:Wen-Zhi Xu、Zhi-Tang Huang、Qi-Yu Zheng
DOI:10.1021/jo8008929
日期:2008.7.1
A facile one-pot method to prepare benzo[c]xanthones from readily accessible benzylidene-1-tetralones by the ultraviolet radiation-mediated tandemreaction is reported. The overall transformation presumably involves cis−trans isomerization, oxa-6π electrocyclization, singlet oxygen ene reaction, dehydration, and aromatization.
报道了一种容易的一锅法,该方法通过紫外线介导的串联反应从容易获得的亚苄基-1-四氢萘酮制备苯并[ c ]氧杂蒽。整个转化可能涉及顺反异构化,oxa-6π电环化,单线态氧烯反应,脱水和芳构化。
Ru-catalyzed asymmetric hydrogenation of α,β-unsaturated ketones <i>via</i> a hydrogenation/isomerization cascade
作者:Kun Wang、Saisai Niu、Weijun Tang、Dong Xue、Jianliang Xiao、Hongfeng Li、Chao Wang
DOI:10.1039/d4cc00356j
日期:2024.4.16
Ru-catalyzed asymmetric hydrogenation of α-substituted α,β-unsaturatedketones has been developed for the enantioselective synthesis of chiral α-substituted secondary alcohols with high diastereo- and enantioselectivities (up to >99 : 1 dr, 98% ee). Mechanistic experiments suggest that the reaction proceeds via a Ru-catalyzed asymmetric hydrogenation of the CO bond in concert with a base-promoted allylic