An Efficient, Regioselective Amination of 3,5-Disubstituted Pyridine N-Oxides Using Saccharin as an Ammonium Surrogate
摘要:
A process for the regioselective amination of unsymmetrical 3,5-substituted pyridine N-oxides has been developed utilizing cheap, readily available saccharin as an ammonium surrogate. High conversions of the corresponding saccharin adducts have been achieved under mild reaction conditions. In situ deprotection under acidic conditions allows for a one-pot process to substituted aminopyridines. High regioselectivities were obtained from a variety of 3,5-disubstituted pyridine N-oxides.
An Efficient, Regioselective Amination of 3,5-Disubstituted Pyridine N-Oxides Using Saccharin as an Ammonium Surrogate
摘要:
A process for the regioselective amination of unsymmetrical 3,5-substituted pyridine N-oxides has been developed utilizing cheap, readily available saccharin as an ammonium surrogate. High conversions of the corresponding saccharin adducts have been achieved under mild reaction conditions. In situ deprotection under acidic conditions allows for a one-pot process to substituted aminopyridines. High regioselectivities were obtained from a variety of 3,5-disubstituted pyridine N-oxides.
Structure-Based Design of a Potent, Selective, and Brain Penetrating PDE2 Inhibitor with Demonstrated Target Engagement
作者:Peter Buijnsters、Meri De Angelis、Xavier Langlois、Frederik J. R. Rombouts、Wendy Sanderson、Gary Tresadern、Alison Ritchie、Andrés A. Trabanco、Greet VanHoof、Yves Van Roosbroeck、José-Ignacio Andrés
DOI:10.1021/ml500262u
日期:2014.9.11
Structure-guided design led to the identification of the novel, potent, and selective phosphodiesterase 2 (PDE2) inhibitor 12. Compound 12 demonstrated a >210-fold selectivity versus PDE10 and PDE11 and was inactive against all other PDE family members up to 10 mu M. In vivo evaluation of 12 provided evidence that it is able to engage the target and to increase cGMP levels in relevant brain regions. Hence, 12 is a valuable tool compound for the better understanding of the role of PDE2 in cognitive impairment and other central nervous system related disorders.