One-pot synthesis of thioesters with sodium thiosulfate as a sulfur surrogate under transition metal-free conditions
作者:Yen-Sen Liao、Chien-Fu Liang
DOI:10.1039/c8ob00178b
日期:——
In this paper, we report an efficient synthetic method for thioester formation fromsodium thiosulfate pentahydrate, organic halides, and aryl anhydrides. In the one-pot two-step reactions developed in this study, sodium thiosulfate was used as the sulfur surrogate for acylation with anhydrides, followed by substitution with organic halides through the in situ generation of thioaroylate. Furthermore
Synthesis of S-functionalized thioesters using thioaroylate ions derived from carboxylic acids and tetrathiomolybdate via acyloxyphosphonium intermediates
Thioaroylate ions generated in situ from acyloxyphosphonium salts and tetrathiomolybdate upon Michael addition or ring opening of three membered systems led to a facile synthesis of S-functionalized thioesters. While the ring opening of aziridines gave very good yield of the products, Michael addition and epoxide ring opening gave moderate yields.
Alkaloid-catalysed asymmetric addition of thiocarboxylic S-acids to cyclohex-2-en-1-ones. Absolute configuration of the adducts by O,S-dibenzoate Cotton effect
The cinchona alkaloid-catalysed 1, 4-addition of thiocarboxylicS-acids to cyclohex-2-en-1-ones gives optically active keto-thioesters; the signs of the Cotton Effects of the O, S-dibenzoates were used as a basis for the assignment of their absoluteconfigurations.
Michael addition of thioacetic and thiobenzoic acids to activatedolefins was investigated in the presence of water under catalyst-free conditions. This process, in addition to being green, has an excellent yield. With simple filtration, high-quality products were obtained on a large scale. Competitive dithiane formation and ester cleavage were not observed. Also, excellent yield was obtained using