The insertion reaction of isocyanides with thiocarbamates and selenocarbamates in the presence of a Pd(0) catalyst to selectively give 2-oxoethanimidothioates and -selenoates is reported. This is the first example of the insertion of an isocyanide into a carbon–heteroatom bond using a transition-metal catalyst. DFT calculations suggest that the reaction proceeds through a thiopalladation pathway at the migratory insertion process.
A general visible-light-promoted metal-free synthesis of secondary and tertiary thiocarbamates starting from thiosulfonates and N-substituted formamides is developed. By employing rhodamine B as a photocatalyst and tert-butyl hydroperoxide (TBHP) as an oxidant, a wide scope of thiocarbamates can be obtained through direct thiolation of acyl C–H bonds under irradiation of blue light at room temperature
开发了从硫代磺酸盐和N-取代甲酰胺开始的一般可见光促进的无金属合成二级和三级硫代氨基甲酸盐。以罗丹明 B 为光催化剂,叔丁基过氧化氢(TBHP)为氧化剂,在室温下蓝光照射 12 小时,直接将酰基 C-H 键硫醇化,可以得到大范围的硫代氨基甲酸酯。
Experimental and Theoretical Studies on the Nucleofugality Patterns in the Aminolysis and Phenolysis of <i>S</i>-Aryl <i>O</i>-Aryl Thiocarbonates
作者:Enrique A. Castro、Margarita Aliaga、Paola R. Campodónico、Marjorie Cepeda、Renato Contreras、José G. Santos
DOI:10.1021/jo902005y
日期:2009.12.4
theoretical analysis based on the group electrophilicity index, a reactivity descriptor that may be taken as a measure of the ability of a group or fragment to depart from a molecule with the bonding electron pair. The theoretical analysis is in accordance with the experimental results obtained and predicts relative nucleofugalities of O-aryl vs. S-aryl groups in a series of diaryl thiocarbonates not experimentally
Achieving functional group diversity in parallel synthesis: solution-phase synthesis of a library of ureas, carbamates, thiocarbamates, and amides using carbamoylimidazolium salts
作者:Justyna A. Grzyb、Robert A. Batey
DOI:10.1016/j.tetlet.2008.06.096
日期:2008.9
A convenient protocol for the parallelsolution-phasesynthesis of a library of thiocarbamates, ureas, carbamates, and amides from carbamoylimidazolium salts has been developed. The crystalline carbamoylimidazolium salts are readily synthesized from secondary amines, CDI and iodomethane, and act as stable carbamoylation reagents. A common set of reaction conditions and a straightforward non-chromatographic
the synthesis of thiocarbamates has been developed. When dialkyl or diaryl disulfides were allowed to react with secondary amines and carbonmonoxide in the presence of a catalytic amount of a palladium complex, the thiocarbamates were obtained in moderate to good yields. In contrast to that of secondary amines, in the reaction of a primary amine, no formation of thiocarbamate was confirmed, but urea