Base-Catalyzed Transesterification of Thionoesters
作者:Josiah J. Newton、Robert Britton、Chadron M. Friesen
DOI:10.1021/acs.joc.8b02260
日期:2018.10.19
Here we report a convenient synthesis of thionoesters by base-catalyzed transesterification. Benzyl and alkyl thionobenzoates and thionoheterobenzoates were efficiently prepared using various alcohols catalyzed by the corresponding sodium alkoxide. This methodology features a broad substrate scope, good to excellent yields, short reaction times, while simultaneously driving the reaction toward completion
A Convenient Synthesis of Difluoroalkyl Ethers from Thionoesters Using Silver(I) Fluoride
作者:Josiah Newton、Daniel Driedger、Matthew B. Nodwell、Paul Schaffer、Rainer E. Martin、Robert Britton、Chadron M. Friesen
DOI:10.1002/chem.201904132
日期:2019.12.13
thionoesters using only silver(I) fluoride. This reaction demonstrates excellent functional group tolerance and complements existing strategies for difluoroalkyl ethersynthesis, which rely on toxic and often dangerous reagents that demonstrate limited functional group compatibility. We additionally report the translation of this finding to the production of 18 F-labelled difluoroalkyl ethersusing fluoride-derived
在此,我们报告了仅使用氟化银 (I) 对硫酯进行温和快速的氟化脱硫。该反应表现出出色的官能团耐受性,并补充了现有的二氟烷基醚合成策略,这些策略依赖于有毒且通常是危险的试剂,这些试剂表现出有限的官能团相容性。我们还报告了将这一发现转化为使用氟化物衍生的 [18 F]AgF 生产 18 F 标记的二氟烷基醚。这种新工艺应该能够合成范围广泛的二氟烷基醚,并在医药和材料化学以及放射性示踪剂生产中得到应用。
Generation and characterization of aliphatic selenothioic acid salts
作者:Toshiaki Murai、Takamasa Nonoyama
DOI:10.1016/j.tet.2012.06.076
日期:2012.12
The reaction of thioic acidO-methylesters with in situ generated aluminum 2-(trimethylsilyl)ethylselenolate gave selenothioicacid Se-(2-trimethylsilyl)ethyl esters in 56–78% yields. The resulting four esters were treated with a THF solution of tetrabutylammonium fluoride (TBAF) to generate selenothioicacid ammonium salts in low to good yields. The efficiency of the generation of the salts depended
New Methods and Reagents in Organic Synthesis. 59. Lithium Trimethylsilydiazomethane: A New Synthon for the Preparation of 5-Substituted 1,2,3-Thiadiazoles
作者:Toyohiko Aoyama、Yuji Iwamoto、Takayuki Shioiri
DOI:10.3987/r-1986-03-0589
日期:——
Difluorination of esters. Preparation of .alpha.,.alpha.-difluoro ethers
作者:William H. Bunnelle、Bradley R. McKinnis、B. A. Narayanan