A one-pot regioselective synthetic route to vinyl sulfones from terminal epoxides in aqueous media
作者:Ruchi Chawla、Ritu Kapoor、Atul K. Singh、Lal Dhar S. Yadav
DOI:10.1039/c2gc16664j
日期:——
A highly efficient LiBr catalysed regioselective synthesis of vinyl sulfones from readily available terminal epoxides and sodium sulfinates in a one-pot procedure using water as a reaction medium is reported. The protocol is adorned with several attributes of green chemistry like recycling of the catalyst, atom-economy and an aqueous medium.
Domino imino-aldol-aza-Michael and imino-aldol-aza-Michael-imino-aldol reactions: Diastereoselective synthesis of highly functionalized 2,6-disubstituted piperidines
作者:Subhomoy Das、Gaurav Goswami、Sandipan Halder、Manas K. Ghorai
DOI:10.1016/j.tet.2021.132285
日期:2021.7
imino-aldol-aza-Michael-imino-aldol reactions of α-(aryl/alkyl)methylidene-β-diketones with activated N-aryl aldimines (1.0 and 2.0 equiv., respectively) have been developed for the diastereoselective (de >99%) synthesis of two sets of highly functionalized 2,6-disubstituted piperidines. The reaction course follows an intermolecular imino-aldol reaction followed by an intramolecular aza-Michael reaction with 1
Additionally, the fluorescence intensity of probe 4d rose approximately 85-fold with increasing viscosity. The probes 4a–4d demonstrated good stability and photostability in a broad pH range. Moreover, probes 4a–4d showed significantly improved biocompatibility compared to those derived from 3a–3d. For cell imaging applications, the developed probes 4a–4d exhibited much stronger blue fluorescence in cancer