Pyridino-directed lithiation of anisylpyridines: new access to functional pyridylphenols
作者:Michaël Parmentier、Philippe Gros、Yves Fort
DOI:10.1016/j.tet.2004.10.100
日期:2005.3
The lithiation of nine anisylpyridines has been studied. While usual reagents did not react or gave addition products on pyridine ring, the BuLi-LiDMAE (LiDMAE=Me2N(CH2)2OLi) superbase induced exclusive pyridino directedmetallation. The usefulness of this new reaction allowed the efficient preparation of a range of alpha functional pyridylphenols. A successful subsequent cyclisation of an appropriate
已经研究了九种茴香基吡啶的锂化。尽管通常的试剂在吡啶环上不发生反应或未提供加成产物,但BuLi-LiDMAE(LiDMAE = Me 2 N(CH 2)2 OLi)超碱诱导了吡啶基定向金属化反应。该新反应的有用性允许有效地制备一系列α官能的吡啶基酚。随后还成功地将合适的异构体成功环化为相应的苯并呋喃基吡啶。
A New One-Pot, Three-Component
Synthesis of 2,3,5-Substituted or Annulated-6-(Methylthio)pyridines
A new one-pot, three-component synthesis of 2,3,5-substituted (or 2,3 -annulated)-6-(methylthio)pyridines by reacting acyclic or cyclic active methylene ketones, ammonium acetate, and bis(methylthio)acrolein (1) or its 2-phenyl analogue 8 (as 3-carbon-1,3-biselectrophilic components) in the presence of either AcOH-TFA (4:1) or ZnBr 2 (or Znl 2 ) catalysts has been reported.