Alkylation of aromatic nitriles in the presence of pyridine transition metal complexes yields 2- and 4-alkylbenzonitriles.
在吡啶过渡金属配合物存在下芳族腈的烷基化产生 2- 和 4- 烷基苄腈。
2H-CHROMENE COMPOUND AND DERIVATIVE THEREOF
申请人:Harada Hironori
公开号:US20120178735A1
公开(公告)日:2012-07-12
Provided is a 2H-chromene compound or a derivative thereof which has an excellent S1P1 agonist action. The 2H-chromene compound or derivative is particularly useful for preventing and/or treating a disease induced by undesirable lymphocyte infiltration or a disease induced by abnormal proliferation or accumulation of cells.
Disclosed herein is the first general chemo- and site-selective alkylation of C-Br bonds in the presence of COTf, C-Cl and other potentially reactive functional groups, using the air-, moisture-, and thermally stable dinuclear PdI catalyst, [Pd(μ-I)PtBu3 ]2 . The bromo-selectivity is independent of the substrate and the relative positioning of the competing reaction sites, and as such fully predictable