rate-determining step as the basicity of amines increases. The corresponding Brønsted-type plot for the reactions with secondaryamines is also biphasic with β1 = 0.34, β2 = 0.74, and pKa° = 9.1, indicating that the effect of amine nature on the reaction mechanism and pKa° is insignificant. However, primaryamines have been found to be less reactive than isobasic secondaryamines. The microscopic rate constants
Pyrrolopyrimidine derivatives of formula (I) are inhibitors of Spleen Tyrosine kinase (Syk) and therefore of potential therapeutic benefit in the treatment of diseases and conditions associated with inappropriate Syk activity, in particular in the treatment of inflammatory and allergic diseases.
作者:Anthony F Hegarty、Stephen J Eustace、Nuala M Tynan、Nguyen-Nguyen Pham-Tran†、Minh Tho Nguyen
DOI:10.1039/b006582j
日期:——
are not observed as products, these ions have been calculated to be the most favoured protonated forms of ylides either in the gas phase or in a continuum of solvent, irrespective of its polarity. Ab initio calculations were carried out using molecular orbital methods (HF, MP2 and CCSD(T)) with basis sets ranging from 6-31G(d) to 6-311++G(3df,2p) and density functional theory (B3LYP) in conjunction with