The present invention provides an agent for treating malignant tumor, comprising a compound of formula (1): wherein R1 to R4 are hydrogen atom, halogen, or etc., Y is optionally-substituted alkylene group or etc.
Aerobicoxidation of aldehydes to 1,2‐ and 1,3‐diol monoesters was catalyzed by polymer‐incarcerated gold nanoclusters under ambient conditions. The esterification proceeded much faster with 1,2‐ and 1,3‐diols and their derivatives rather than with methanol.
Oxidative esterification of benzylic alcohols with a catalytic amount of HBr-H2O2 in aqueous medium under mild conditions is reported with a wide range of substrate scope for both benzylic and aliphatic alcohols. The conditions are also suitable for selective mono-esterification of ethylene glycol and glycerol. With catalytic amounts of HBr (20 mol%) and H2O2, the generation of reactive intermediate species BrOH has been ascertained by UV-visible spectra.
unprecedented chemoselective transformation has contributed to forming a novel synthetic process for target molecules. Chemoselective oxidation of aromatic acetals has been accomplished using a reusable palladium on carbon catalyst under atmospheric oxygen conditions to form ester derivatives with tolerance of aliphatic acetals and ketals.
Towards a sustainable synthesis of aniline-derived amides using an indirect chemoenzymatic process: challenges and successes
作者:Samridhi Lal、Timothy J. Snape
DOI:10.1039/c3ra46499g
日期:——
A general, catalytic and sustainable synthesis of amides has been targeted which utilises a chemoenzymatic step to generate an activated amide coupling partner in situ. A screen of a series of known activating agents was performed and the successful agents taken forward to determine their utility in such a one-pot enzyme-catalysed process. In these studies, a new chemoselective reagent ((isopropylideneamino)