Substituent Effects on the Reactivity of Benzo-1,2-dithiolan-3-one 1-Oxides and Their Possible Application to the Synthesis of DNA-Targeting Drugs
摘要:
[GRAPHICS]The efficiency of polysulfane product generation has been investigated for n-propyl thiol reactions with ortho- and para-substituted benzo-1,2-dithiolan-3-one 1-oxides in acetonitrile-water (7:3) mixtures. The reaction is facilitated by reducing the electron density at the para position or by placing substituents bearing lone pair electrons ortho to the dithiolanone-oxide (S1) reaction center. Through-space and through-bond effects both contribute to the conversion of polysulfane products.
Substituent Effects on the Reactivity of Benzo-1,2-dithiolan-3-one 1-Oxides and Their Possible Application to the Synthesis of DNA-Targeting Drugs
摘要:
[GRAPHICS]The efficiency of polysulfane product generation has been investigated for n-propyl thiol reactions with ortho- and para-substituted benzo-1,2-dithiolan-3-one 1-oxides in acetonitrile-water (7:3) mixtures. The reaction is facilitated by reducing the electron density at the para position or by placing substituents bearing lone pair electrons ortho to the dithiolanone-oxide (S1) reaction center. Through-space and through-bond effects both contribute to the conversion of polysulfane products.
Switchable Copper-Catalyzed Approach to Benzodithiole, Benzothiaselenole, and Dibenzodithiocine Skeletons
作者:Meng-Qiao Huang、Tuan-Jie Li、Jian-Quan Liu、Andrey Shatskiy、Markus D. Kärkäs、Xiang-Shan Wang
DOI:10.1021/acs.orglett.0c00907
日期:2020.5.1
A copper-catalyzed reaction between 2-bromo-benzothioamides and S8 or Se involving sulfur rearrangement is reported, enabling access to benzodithioles 2 and benzothiaselenoles 6 in the presence of Cs2CO3. In the absence of S8 or Se, the reaction affords dibenzodithiocines 7 via two consecutive C(sp2)-S Ullmann couplings.