Regioselective allylation of enol silyl ethers with γ-heterosubstituted vinylthionium ions
作者:Roger Hunter、Joseph P. Michael、Daryl S. Walter
DOI:10.1016/s0040-4039(00)73530-1
日期:1994.7
γ-Heterosubstituted vinylthioniumions regioselectively and diastereoselectively allylate enolsilylethers. Intramolecular capture of a vinylthioniumion is used as a key step of a novel pentannulation sequence.
Preparation of aminosaccharides using ester-imine condensations: syntheses of methyl -benzoylacosaminide and methyl -[oxo(phenylmethoxy) acetyl)daunosaminide from (S)-ethyl 3-hydroxybutyrate
作者:Judith C. Gallucci、Deok-Chan Ha、David J. Hart
DOI:10.1016/0040-4020(89)80126-7
日期:1989.1
The dianion of (S)-ethyl β-hydroxybutyrate (1) was treated with -trimethylsilyl Imine 2 to afford β-lactam 4. The same dianion reacted with -ary1 imine 10 to give β-lactams 11, 12, and 13. A three-step sequence was used to convert 4 into the β-lactam-pyran hybrid 9 while a five-step sequence was developed to transform 11 and 12 into 9. Application of the carboxyinversion reaction to derivatives of
Selective oxidation of hydroxy groups of phenylthio and phenylseleno alcohols
作者:Makoto Shimizu、Hirokazu Urabe、Isao Kuwajima
DOI:10.1016/s0040-4039(01)90493-9
日期:1981.1
Various kinds of alcohols bearing phenylthio or phenylseleno moiety were converted into the corresponding carbonyl compounds in good to excellent yields by treating with dimesityl diselenide and -butyl hydroperoxide.
Herein, a chemoselective cascade addition reaction is reported, which starts from1,2,3-triazines and thiols to access several different α-substituted β-thio enals and their derivatives in a green and efficient synthesis. In terms of applications, readily available substrates, diversity of products, and mild reaction system make this strategy highly attractive.