Integrated Transition Metal Catalysed Reactions: Synthesis of Polysubstituted 4-(Phenoxymethyl)-3-pyrrolines and Their Isomers by One-Pot Coupling of Propargylamines, Vinyl Sulfones (or Nitroalkenes) and Phenols
The invention describes a process for stabilizing an organic material against oxidative, thermal or light-induced degradation, which comprises incorporating therein or applying thereto at least a compound of the formula (I) wherein the general symbols are as defined in claim
1
. The compounds of the formula I are especially useful as processing stabilizers for synthetic polymers.
Thermal reactions of substituted cyclopropenone acetals. Regio- and stereochemistry of vinylcarbene formation and low-temperature [3 + 2] cycloaddition
of diverse electronic character have been synthesized and examined for their thermal behavior toward water and electron-deficient olefins. The substituted cyclopropenes underwent regio- and stereoselective hydration to give acrylate derivatives via vinylcarbene species, providing new data on the regio- and stereochemistry of vinylcarbene species. The also underwent regioselective [3+2] cycloadditions
pyrrole-3-carboxylates and 3,4-disubstituted pyrrolidin-2-ones. The latter were prepared by means of an unprecedented rearrangement process involving hydrogenolysis of 2-aryl pyrrolidine-3-carboxylates, whereas the pyrrole carboxylates arose from aromatization of the corresponding pyrrolines.
The efficient and practical syntheses of functionalized carbo-and heterocyclic compounds have been achieved employing a process based on an intramolecular palladium-mediated cyclization coupled with a carbon-carbon bond forming reaction.
通过采用基于分子内钯介导的环化反应与碳-碳键形成反应相结合的工艺,实现了功能化碳杂环化合物的高效、
Reddy, G. Ramachandra; Gupta, S. V. S. Aruna Kumar; Reddy, D. Bhaskar, Journal of the Indian Chemical Society, 1992, vol. 69, # 7, p. 396 - 397
作者:Reddy, G. Ramachandra、Gupta, S. V. S. Aruna Kumar、Reddy, D. Bhaskar、Seenaiah, B.