A significant substituent effect on the regioselectivity in addition of alkynes to 3-substituted pyridines
作者:Shinji Yamada、Aya Toshimitsu、Yasuko Takahashi
DOI:10.1016/j.tet.2009.01.022
日期:2009.3
A substituent at the 3-position on a pyridine ring significantly affects the regioselectivity during the addition of alkynes to pyridinium salts. When the substituent is an electron-withdrawing group, 1,6-adducts are predominantly produced, whereas, 1,2-adducts become the major products when the substituent is an electron-donating group. The changes in the regioselectivity depending on the substituent
success of the desulfitative Sonogashira cross-coupling reaction of thioamide-type pyridine derivatives and alkynes. Corresponding alkynylated products were obtained with moderate to excellent yields. Thanks to this reaction, furo[3,2-b]pyridine and 1H-pyrrolo[3,2-b]pyridine derivatives were synthesized through a one-pot cross-coupling reaction/heteroannulation sequence.
事实证明,邻位螯合辅助对于硫酰胺型吡啶衍生物和炔烃的脱硫Sonogashira交叉偶联反应的成功至关重要。以中等至优异的产率获得了相应的炔基化产物。由于该反应,通过一锅交叉偶联反应/杂环化序列合成了呋喃[3,2- b ]吡啶和1 H-吡咯并[3,2- b ]吡啶衍生物。
AKT / PKB INHIBITORS
申请人:Bell Mark Peter
公开号:US20120309739A1
公开(公告)日:2012-12-06
The invention relates to a series of compounds with particular activity as inhibitors of the serine-threonine kinase AKT. Also provided are pharmaceutical compositions comprising same as well as methods for treating cancer.
The invention relates to a series of compounds with particular activity as inhibitors of the serine-threonine kinase AKT. Also provided are pharmaceutical compositions comprising same as well as methods for treating cancer.