New synthetic methods : sodium alkanechalcogenates as demethylating agents. Scope, limitation and new one-pot synthesis of diaryldiselenides.
作者:Michel Evers、Léon Christiaens
DOI:10.1016/s0040-4039(00)81412-4
日期:——
Sodium alkanechalcogenates (S, Se) cleave the alkylarylchalcogenides (O, S, Se). The versatility of such reagents is developed and applied to a newsynthesis of diaryldiselenides.
Ruthenium Catalyzed C–H Selenylations of Aryl Acetic Amides and Esters via Weak Coordination
作者:Zhengyun Weng、Xinyue Fang、Meicui He、Linghui Gu、Jiafu Lin、Zheyu Li、Wenbo Ma
DOI:10.1021/acs.orglett.9b02196
日期:2019.8.16
An efficient ruthenium-catalyzed direct C–H selenylation of aryl acetic amides and esters has been achieved via distal weakly coordination. Notable features of this protocol including broad substrate scope, wide functional group tolerance, and good regioselectivity. In addition, diaryl disulfides were also successfully applied to this reaction under slightly modified conditions.
A new protocol was developed to synthesize (enantioenriched) thioethers and selenoethersfrom (chiral) benzylic trimethylammonium salts and di(hetero)aryl disulfides or diselenides. These syntheses were promoted by the presence of weak base and did not require the use of any transition metal, and resulted in the target products with good to excellent yields (72–94%). Using quaternary ammonium salts
作者:Rahul N. Gaykar、Avishek Guin、Subrata Bhattacharjee、Akkattu T. Biju
DOI:10.1021/acs.orglett.9b03789
日期:2019.12.6
The three-component coupling of tertiaryamines, arynes, and aryl selenium bromide or diaryl diselenide as an electrophilic selenium source allowing the synthesis of 2-selanyl aniline derivatives is reported. This aminoselenation reaction of arynes installs a C-N and C-Se bond under mild conditions, and the products are formed in moderate to good yields. This reaction is compatible with various functional
Copper-Catalyzed 8-Aminoquinoline-Directed Selenylation of Arene and Heteroarene C–H Bonds
作者:Anup Mandal、Harekrishna Sahoo、Mahiuddin Baidya
DOI:10.1021/acs.orglett.6b01420
日期:2016.7.1
An efficient copper-catalyzed/-mediated and 8-aminoquinoline-assisted arylselenylation of inert C–H bonds of (hetero)arenes with readily available diselenides has been reported. The reaction is scalable and tolerates a wide spectrum of functional groups to deliver diarylselenides in very high yields (up to 98%). Application of this methodology to the facile synthesis of thiophene-fused selenochromone