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
Organocatalytic selenosulfonylation of the C–C doublebond of α,β-unsaturatedketones to construct two contiguous stereogenic centers in an aqueous medium was described. A series of α-selenyl and β-sulfonyl ketones with various functional groups were synthesized in good yields and enantioselectivities with saturated NaCl solution as the solvent. In addition, this protocol had been successfully scaled
Visible-light-driven radical 1,3-addition of selenosulfonates to vinyldiazo compounds
作者:Weiyu Li、Lei Zhou
DOI:10.1039/d1gc02036f
日期:——
radical 1,3-selenosulfonylation of vinyldiazo compounds with selenosulfonates, providing various γ-seleno allylic sulfones in good yields. This photochemical reaction was carried out at room temperature in an open flask using ethyl acetate as the solvent without any photocatalysts or additives. The control experiments corroborated that the 1,3-addition proceeded via a radical-chain propagation process. The
A mild, practical, and simple procedure for phenyl selenoesters synthesisfrom several anhydrides and diphenyl diselenide was developed. This transition-metal-free method provides a straightforward entry to storable Fmoc-amino acid selenoesters which are effective chemoselective acylating reagents. An application to oligopeptide synthesis was illustrated.
Visible-light-induced metal and reagent-free oxidative coupling of <i>sp</i><sup>2</sup> C–H bonds with organo-dichalcogenides: synthesis of 3-organochalcogenyl indoles
作者:Vandana Rathore、Sangit Kumar
DOI:10.1039/c9gc00007k
日期:——
and halo either on indoles or aryl dichalcogenides showed amenability to the developed reaction. Furthermore, thiocyanation of the sp2 C–H bonds of indoles has been accomplished by this visible light induced method. A mechanistic understanding by UV-visible, EPR spectroscopy, and cyclic voltammetry suggests that light induces electron transferfrom the electron rich arene to oxygen providing an arene