Conjugate addition of sodium methanesulfinate to vinyl pyridines and diazines for the synthesis of aliphatic sulfones
作者:Gregory M. Schaaf、Sabuj Mukherjee、Alex G. Waterson
DOI:10.1016/j.tetlet.2009.02.037
日期:2009.4
A convenient method to introduce a sulfone group to pyridines and diazines is described. This efficient method involves the conjugate addition of sodium methanesulfinate to vinyl heterocycles. This process tolerates a wide variety of functional groups and is performed in the presence of acetic or trifluoroacetic acid. A one-pot, two-step synthesis of sulfones starting from the corresponding heteroaryl
quantification of amyloid beta (Aβ) plaques is an important indicator for Alzheimer’s disease diagnosis and treatment. For this purpose, new highly sensitive Aβ tracers were designed by regulating the position and number of nitrogen atoms. A series of derivatives of florbetapir (AV45) containing different numbers and positions of N atoms were synthesized and evaluated for in vitro affinity and in vivo biodistribution