Catalytic Phosphorus(V)-Mediated Nucleophilic Substitution Reactions: Development of a Catalytic Appel Reaction
作者:Ross M. Denton、Jie An、Beatrice Adeniran、Alexander J. Blake、William Lewis、Andrew M. Poulton
DOI:10.1021/jo201085r
日期:2011.8.19
from stoichiometric waste products into catalysts and a new concept for catalytic phosphorus-based activation and nucleophilicsubstitution of alcohols has been validated. The present study has focused on a full exploration of the scope and limitations of phosphine oxide catalyzed chlorination reactions as well as the development of the analogous bromination reactions. Further mechanistic studies, including
Catalytic nucleophilic fluorination by an imidazolium ionic liquid possessing trialkylphosphine oxide functionality
作者:Minakshmi Paramanik、Rekha Singh、Sulekha Mukhopadhyay、Sunil K. Ghosh
DOI:10.1016/j.jfluchem.2015.06.022
日期:2015.10
The synthesis of a new alkylmethylimidazolium ionicliquid wherein the alkyl group is functionalized with dihexylphosphine oxide moiety at the terminal position has been achieved in four steps from 1-methylimidazole. This hybrid ionicliquid effectively catalyzed the nucleophilicfluorination of primary alkyl mesylates under mild conditions using CsF as the fluoride source with a faster rate compared
Benzylation of Alcoholic Hydroxyl Groups with Benzyl Mesylate by Using a Catalytic Amount of Lithium Tetrakis(pentafluorophenyl)borate in the Coexistence of Lithium Triflate and Magnesium Oxide
Several alcohols possessing alkali-labile substituents such as halogen, ester and ketone were effectively benzylated with benzyl mesylate by using a catalytic amount of lithium tetrakis(pentafluorophenyl)borate [LiB(C6F5)4] in the coexistence of lithium triflate (LiOTf) and magnesium oxide (MgO) to afford the corresponding benzyl ethers in good to excellent yields.
Regioselective bond cleavage and coordination effects in the reduction of some acetals with lithium in ammonia
作者:A.D. Abell、R.A. Massy-Westropp
DOI:10.1016/s0040-4020(01)96640-2
日期:1985.1
Some benzylic-type acetals possessing the 2,8-dioxa-bicyclo [3.2.1]octane ring system are cleaved in a regioselective manner when treated with lithium in ammonia. The results f rom various reductions implicate coordination of lithium as a significant factor involved in reduction mechanisms.
The present invention comprises 6-9-Disubstituted 2-[trans-(4-aminocyclohexyl]aminopurines that are useful in inhibiting cyclin dependent kinases, particularly cdk-2. The present invention also provides a method of preventing apoptosis in neuronal cells and a method of inhibiting the development of neoplasms.