Reactions of Selenurane [10-Se-4 (C4)] with Alcohols, Thiols and Selenol. A Quest for Formation of a New a-Selenurane [10-Se-4 (C3O)], [10-Se-4 (C3S)] or [10-Se-4 (C3Se)]
作者:Soichi Sato、Naomichi Furukawa
DOI:10.1246/cl.1994.889
日期:1994.5
Bis(2,2′-biphenylylene)selenurane readily reacts with various alcohols, phenols, thiols and selenol to give ligand coupling or ipso-substitution products under mild conditions via a two-step mechanism involving a σ-selenurane [10-Se-4 (C3O)], [10-Se-4 (C3S)] and [10-Se-4 (C3Se)] or corresponding selenonium salts as intermediates.
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。
Sato Soichi, Furukawa Naomichi, Chem. Lett, (1994) N 5, S 889-892