Phase-Transfer Synthesis of Optically Pure Oxetanes Obtained from 1,2,2-Trisubstituted 1,3-Propanediols
作者:Hu Xianming、Richard M. Kellogg
DOI:10.1055/s-1995-3939
日期:1995.5
Treatment of the 3-monomethanesulfonates of 1,2,2-trisubstituted 1,3-propanediols under phase-transfer conditions affords 2-aryl (or alkyl)-3,3-dialkyloxetanes. Twelve oxetanes have been obtained by this method; three of these oxetanes have been obtained enantiomerically pure as both enantiomers starting from the appropriate enantiomerically pure 1,3-diols. In these reactions the chiral center does not undergo inversion and the oxetanes have the same absolute configuration as the starting 1,3-diols.
Real-Time Pyruvate Chemical Conversion Monitoring Enabled by PHIP
作者:Gabriele Stevanato、Yonghong Ding、Salvatore Mamone、Anil P. Jagtap、Sergey Korchak、Stefan Glöggler
DOI:10.1021/jacs.2c13198
日期:2023.3.15
enables the signal enhancement of C1 and/or C2 in [1,2-13C]pyruvate with the opposite phase, which allows for the simultaneous monitoring of different chemical reactions with enhanced spectral contrast or for the same reaction via different carbon sites. We first demonstrate the ability to monitor the same enzymaticpyruvate to lactate conversion at 7T in an aqueous solution, in vitro, and in-cell (HeLa
In order to find high-acitivity and low-toxicity pesticidal lead compounds, a type of novel, asymmetric cyclic phosphorothonamides containing substituted pyridine were synthesized via the condensation reactions of 2-chloro-4-substitutedphenyl-5,5-dimethyl-1,3,2-dioxaphosphinane 2-sulfide with 3-aminomethylpyridine. The cis and trans isomers of the products were isolated by column chromatography on silica gel. The structures of the products were characterized by H-1 NMR, P-31 NMR, MS, and elemental analyses. The configuration of 3a was determined by X-ray diffraction analysis. The results of the preliminary bioassay showed that the new compounds possess potential fungicidal activities.
Herzog; Kruh, Monatshefte fur Chemie, 1900, vol. 21, p. 1107