Ultrasound-Mediated Three-Component Reaction “On-Water” Protocol For the Synthesis of Novel Mono- and bis-1,3-Thiazin-4-one Derivatives
作者:Wael A. A. Arafa、Ashraf M. Mohamed、Ahmed F. Abdel-Magied
DOI:10.3987/com-17-13726
日期:——
Green synthetic and catalyst-free strategy towards the synthesis of novel mono- and bis-1,3-thiazin-4-one scaffolds through a one pot, reaction of carbon disulfide, monoacetylenic esters and amines ...
of in situ generated arynes with vinyl sulfides provides benzannulated sulfonium ylides in a (3+2) cycloaddition. Trapping of the intermediate ylides with electrophiles (proton transfer or a second aryne addition) and subsequent β‐elimination give rise to di‐, tri‐, or tetrasubstituted alkenes with high stereoselectivity. Experimental studies and DFT calculations provide insight into the mechanisms of
Synthesis of Internal gem-Diborylalkanes by Copper-Catalyzed Double Hydroboration of Conjugated Internal Alkynes
作者:Yuma Netsu、Naofumi Tsukada
DOI:10.2174/1570178614666170321114445
日期:2017.6.8
their unique reactivities. Double hydroboration of alkynes is a convenient and useful method for the synthesis of diborylalkanes. However, the double hydroboration is applied mainly to terminal alkynes. Methods: Ethyl propiolate was treated with B2pin2 and methanol in the presence of various copper catalysts and ligands. The reaction of several internal conjugated alkynes was also investigated under the