Zinc Oxide Catalyzed Solvent-Free Mechanochemical Route for C-S Bond Construction: A Sustainable Process
作者:P. Md. Khaja Mohinuddin、N. C. Gangi Reddy
DOI:10.1002/ejoc.201601425
日期:2017.2.24
Zinc oxide-catalyzed solvent-freemechanochemical route has been developed for the rapid construction of C-S bond using a variety of thiols and phenacyl/benzyl/alkyl bromides via a nucleophilic substitution (SN2 mechanism). Notable advantages of this method include broad substrate scope, cleaner reaction profile, safe, scalable, high yields at ambient conditions and reuse of catalyst. Further, the
Convenient and efficient procedures for thiirans have been developed via a one-pot reaction of benzoxazolyl β-ketosulfides with NaBH4 and NaOH in MeOH and THF. The reaction is considered to proceed via the spiro intermediate by the ipso-addition of β-hydroxygroup, which is formed by the NaBH4 reduction of β-keto group, to 2-position of benzoxazole group.