A simple and efficient method has been developed for the synthesis of 2-aminothiazoles from α-bromo ketones in one-potusing a supported reagents system, KSCN/SiO2–RNH3OAc/Al2O3, in which α-bromo ketone reacts first with KSCN/SiO2 and the product, α-thiocyano ketone, reacts with RNH3OAc/Al2O3 to give the final product, 2-aminothiazole, in high yield.
一种简单且有效的方法已用于从α溴酮-2-氨基噻唑在一锅合成中使用负载的试剂系统被开发出来,KSCN /二氧化硅2 -RNH 3 OAC / Al的2 Ó 3,其中α溴酮首先与KSCN / SiO 2反应,然后产物α-硫氰基酮与RNH 3 OAc / Al 2 O 3反应,以高收率得到最终产物2-氨基噻唑。
Hypervalent Iodine(III) Sulfonate Mediated Synthesis of α-Thiocynanatoketones in a Task-Specific Ionic Liquid [bmim]SCN
The task-specificionicliquid (TSIL) and 1-n-butyl-3-methylimidazolium thiocynanate, ([bmim]SCN) were used as the medium as well as the reactant for the synthesis of α-thiocynanatoketones by the reaction with α-sulfonyloxy aryl ketones. Significant rate enhancements and improved yields have been observed.
Boron-doped TiO<sub>2</sub> (B-TiO<sub>2</sub>): visible-light photocatalytic difunctionalization of alkenes and alkynes
作者:Mona Hosseini-Sarvari、Atefe Valikhani
DOI:10.1039/d1nj01752g
日期:——
Boron-doped TiO2 (B-TiO2) was prepared, characterized, and applied as a reusable, inexpensive, and available heterogeneous nanophotocatalyst under visible light for the synthesis of phenacyl thiocyanates.
Novel N-thiazolo-1,3-oxathiol-2-imines are synthesized by reaction of α-haloketones with potassium thiocyanate-silica gel. It is thought that the reaction occurs through conversion of the α-haloketone into the corresponding thiocyanate which then undergoes acid-catalyzed intramolecular cyclization to yield a cationic intermediate. Subsequent reaction of this intermediate with another molecule of the α-thiocyanatoketone and a second cyclization then gives the N-thiazolo-1,3-oxathiol-2-imine.
Ammonium [<sup>11</sup>C]thiocyanate: revised preparation and reactivity studies of a versatile nucleophile for carbon-11 radiolabelling
作者:Tom Haywood、Sara Cesarec、Steven Kealey、Christophe Plisson、Philip W. Miller
DOI:10.1039/c7md00425g
日期:——
[11C]thiocyanate via the reaction of [11C]CS2 with ammonia. The [11C]SCN− ion is demonstrated as a potent nucleophile that can be used to readily generate a range of 11C-labelled thiocyanate molecules in high conversions. Furthermore, novel 11C-labelled thiazolone molecules can be easily prepared from the intermediate α-thiocyanatophenones via an acid mediated cyclisation reaction.