Protecting group-Free Concise Synthesis of (RS)/(S)-Lubeluzole
摘要:
Three new, concise, and protecting group-free synthetic routes for (RS)- and (S)-lubeluzole are reported in higher (46-62%) overall yields compared to the reported procedures (6-35%). The key steps involve C-N bond formation via epoxide aminolysis and nucleophilic substitution of 2-chlorobenzothiazole with suitably designed precursor amines and are performed in aqueous medium. Water offers an advantage in promoting the reactions compared to organic solvents and its role Is envisaged as hydrogen-bond mediated electrophile-nucleophile dual activation.
Protecting group-Free Concise Synthesis of (RS)/(S)-Lubeluzole
摘要:
Three new, concise, and protecting group-free synthetic routes for (RS)- and (S)-lubeluzole are reported in higher (46-62%) overall yields compared to the reported procedures (6-35%). The key steps involve C-N bond formation via epoxide aminolysis and nucleophilic substitution of 2-chlorobenzothiazole with suitably designed precursor amines and are performed in aqueous medium. Water offers an advantage in promoting the reactions compared to organic solvents and its role Is envisaged as hydrogen-bond mediated electrophile-nucleophile dual activation.
Protecting group-Free Concise Synthesis of (<i>RS</i>)/(<i>S</i>)-Lubeluzole
作者:Damodara N. Kommi、Dinesh Kumar、Kapileswar Seth、Asit K. Chakraborti
DOI:10.1021/ol302601b
日期:2013.3.15
Three new, concise, and protecting group-free synthetic routes for (RS)- and (S)-lubeluzole are reported in higher (46-62%) overall yields compared to the reported procedures (6-35%). The key steps involve C-N bond formation via epoxide aminolysis and nucleophilic substitution of 2-chlorobenzothiazole with suitably designed precursor amines and are performed in aqueous medium. Water offers an advantage in promoting the reactions compared to organic solvents and its role Is envisaged as hydrogen-bond mediated electrophile-nucleophile dual activation.