Dithiocarbamate as an efficient intermediate for the synthesis of 2-(alkylthio)thiazol-4(5<i>H</i>)-ones
作者:Azim Ziyaei Halimehjani、M. Ali Alaei、Farzaneh Soleymani Movahed、Negin Jomeh、Mohammad R. Saidi
DOI:10.1080/17415993.2016.1194421
日期:2016.9.2
ABSTRACT An effective approach for the synthesis of 2-(alkylthio)thiazol-4(5H)-ones from alkyl dithiocarbamates and chloroacetyl chloride in the presence of NaHCO3 has been developed. Good to excellent yields of products, simple reaction conditions and general applicability are the most important advantages of this protocol. GRAPHICAL ABSTRACT
Catalytic Asymmetric [4 + 2] Cycloadditions of Ketenes and <i>N</i>-Thioacyl Imines: Alternatives for Direct Mannich Reactions of Enolizable Imines
作者:Xuan Xu、Kan Wang、Scott G. Nelson
DOI:10.1021/ja074845n
日期:2007.9.1
cinchona alkaloid-catalyzed ketene-N-thioacyl iminecycloadditions afford enantioenriched cis-4,5-disubstituted 1,3-thiazin-6-one heterocycles with high absolute and relative stereocontrol. These cycloadditions enable a strategy for executing catalytic asymmetric direct Mannich additions to enolizable, unactivated imines. The ketene and iminereaction components are both generated in situ from readily