Using an easily prepared triethylammonium N‐benzyldithiocarbamate salt as a sulfur source, a dual C−S functionalization of cyclic diaryliodoniums to form tricyclic thioheterocycles is realized. Our method uses the readily available copper sulfate to accelerate the chemical transformation under mild conditions. A broad range of cyclic diaryliodoniums with a ring size from 5‐ to 7‐membered can be employed
A palladium-catalyzed synthesis of dibenzothiophenes from 2-biphenylthiols is described. This highly efficient reaction employs a simple PdCl2/DMSO catalytic system, in which PdCl2 is the sole metal catalyst and DMSO functions as an oxidant and solvent. This transformation has broad substrate scope and operational simplicity and proceeds in high yield. The synthetic utility was demonstrated by the
A new process has been developed for the palladium(II)-catalyzedsynthesis of dibenzothiophene derivatives via the cleavage of C–H and C–S bonds. In contrast to the existing methods for the synthesis of this scaffold by C–H functionalization, this new catalytic C–H/C–S coupling method does not require the presence of an external stoichiometric oxidant or reactive functionalities such as C–X or S–H
开发了一种通过C-H 和 C-S 键裂解钯 ( II ) 催化合成二苯并噻吩衍生物的新工艺。与现有的通过 C-H 官能化合成该支架的方法相比,这种新的催化 C-H/C-S 偶联方法不需要存在外部化学计量氧化剂或反应性官能团,例如 C-X 或 S -H,允许其应用于复杂的 π 系统的合成。值得注意的是,该反应的产物形成步骤在于氧化加成步骤而不是还原消除步骤,使得该反应在机理上不常见。
Substituted dibenzothiaphenes
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0342433A2
公开(公告)日:1989-11-23
This disclosure describes novel derivatives of dibenzothiophene, dibenzothiophene sulfoxide, dibenzothiophene sulfone, thioxanthene, thioxanthene sulfoxide and thioxanthene sulfone which are active as modulators of the mammalian immune response system.