source have been employed for the first time to enable direct amination on unactivatedC(sp3)–Hbonds of thioamides under Cp*CoIII catalysis. The excellent site-selectivity on primary C(sp3)–Hbonds is observed for a diverse array of thioamides with high functional group tolerance. Further applicability of the products is also highlighted through a series of interesting synthetic elaborations.
具有合成功能的邻氨基苯甲酸酯作为双功能氨基源已被首次使用,能够在Cp * Co III催化下直接胺化未活化的硫代酰胺的C(sp 3)-H键。对于具有高官能团耐受性的各种硫酰胺,可以观察到对主要的C(sp 3)–H键具有出色的位点选择性。通过一系列有趣的合成细节也突出了产品的进一步适用性。
Direct Thionation and Selenation of Amides Using Elemental Sulfur and Selenium and Hydrochlorosilanes in the Presence of Amines
作者:Fumitoshi Shibahara、Rie Sugiura、Toshiaki Murai
DOI:10.1021/ol9010882
日期:2009.7.16
Reactions of amides with elemental sulfur in the presence of hydrochlorosilanes and amines give the corresponding thioamides in good to high yields. The process takes place via reduction of elemental sulfur by the hydrochlorosilane in the presence of a suitable amine. The methodology can be applied to the selenation of amides by using elemental selenium. Thionation and selenation of an acetyl-protected
α-Arylation of Saturated Azacycles and <i>N</i>-Methylamines via Palladium(II)-Catalyzed C(sp<sup>3</sup>)–H Coupling
作者:Jillian E. Spangler、Yoshihisa Kobayashi、Pritha Verma、Dong-Hui Wang、Jin-Quan Yu
DOI:10.1021/jacs.5b06740
日期:2015.9.23
Pd(II)-catalyzed α-C(sp(3))-Harylation of pyrrolidines, piperidines, azepanes, and N-methylamines with arylboronic acids has been developed for the first time. This transformation is applicable to wide arrays of pyrrolidines and boronic acids, including heteroaromatic boronic acids. A diastereoselective one-pot heterodiarylation of pyrrolidines has also been achieved.