在富电子芳族化合物与儿茶酚硼烷的亲电CHH硼化反应中,亲电硼的催化生成是由各种Lewis和Brønsted酸对BH键的杂化作用引发的,它仅形成硼离子。配体解离后,相应的硼离子在苯胺衍生物以及含氮杂环上进行区域选择性亲电芳香取代。使用B(C 6 F 5)3来优化催化作用作为引发剂,并且在不添加外部碱或二氢受体的情况下进行。为了确保这些Friedel-Crafts型反应的有效转换,通常需要高于80°C的温度。机理实验表明,释放氢的硼/硼离子的再生是决定速率的。这一发现最终导致人们发现,添加烯烃后,催化CHH硼化可以首次在室温下进行。
SUBSTITUTED PYRIDOPYRAZINES AS NOVEL SYK INHIBITORS
申请人:Su Wei-Guo
公开号:US20140121200A1
公开(公告)日:2014-05-01
Provided are pyridopyrazine compounds of formula (1), pharmaceutical compositions thereof and methods of use therefore, wherein R
1
, R
2
, R
3
, R
4
and m are as defined in the specification.
Substituted pyrido[3,4-b]pyrazines as Syk inhibitors
申请人:Su Wei-Guo
公开号:US09434726B2
公开(公告)日:2016-09-06
Provided are pyridopyrazine compounds of formula (I), pharmaceutical compositions thereof and methods of use therefore, wherein R1, R2, R3, R4 and m are as defined in the specification.