Aryl- and heteroaryl-substituted urea compounds useful in the treatment of diseases and conditions related to DNA damage or lesions in DNA replication are disclosed. Methods of making the compounds, and their use as therapeutic agents, for example, in treating cancer and other diseases characterized by defects in DNA replication, chromosome segregation, or cell division also are disclosed.
Nonsolvent Application of Ionic Liquids: Organo-Catalysis by 1-Alkyl-3-methylimidazolium Cation Based Room-Temperature Ionic Liquids for Chemoselective <i>N</i>-<i>tert</i>-Butyloxycarbonylation of Amines and the Influence of the C-2 Hydrogen on Catalytic Efficiency
作者:Anirban Sarkar、Sudipta Raha Roy、Naisargee Parikh、Asit K. Chakraborti
DOI:10.1021/jo201102q
日期:2011.9.2
1-Alkyl-3-methylimidazolium cation based ionicliquids efficiently catalyze N-tert-butyloxycarbonylation of amines with excellent chemoselectivity. The catalytic role of the ionicliquid is envisaged as “electrophilic activation” of di-tert-butyl dicarbonate (Boc2O) through bifurcated hydrogen bond formation with the C-2 hydrogen of the 1-alkyl-3-methylimidazolium cation and has been supported by a
1-烷基-3-甲基咪唑鎓阳离子类离子液体有效地催化ñ -叔胺的-butyloxycarbonylation具有优良的化学选择性。所述离子液体的催化作用是设想为二的“亲电活化”叔丁基酯(BOC 2 O)通过分叉氢键的形成与1-烷基-3-甲基咪唑鎓阳离子的和C-2的氢已由咪唑C-2氢1-丁基-3-甲基咪唑鎓双(三氟甲基磺酰)亚胺([BMIM] [NTF的的低磁场移位支撑2从δ8.39]),以8.66的中的Boc存在2于O 11 H NMR和无C-2氢的1-丁基-2,3-二甲基咪唑鎓离子液体的催化效率急剧降低。与芳族和脂族胺反应所需的不同时间为分子间和分子内竞争期间选择性形成N - t- Boc提供了手段。在伯脂族胺的存在下,已经与仲脂族胺形成了优选的N - t- Boc。比较N - t -Boc与常见底物的催化效率,发现[bmim] [NTf 2 ]优于已报道的路易斯酸催化剂。
Palladium-Catalysed Carbo- and Hydroamination of Allenyl Ethers and Aminoallenes: Available Entry to Nitrogen-Containing Benzo-Fused Rings
作者:Silvia Gazzola、Egle M. Beccalli、Alice Bernasconi、Tea Borelli、Gianluigi Broggini、Alberto Mazza
DOI:10.1002/ejoc.201600720
日期:2016.9
carbo- and hydroamination processes resulted in the formation of nitrogen-containing benzo-fused rings. In the case of aminoallenes arising from o-phenylenediamine, the regioselectivity of the cyclization step was strongly dependent on the protecting group tethered to the nitrogen atoms, allowing the formation of five- and seven-membered rings.
An Expedient Synthesis of 2-Aryl-1,4-benzoxazin-3-ones via Tandem Anionic Cyclisation/Alkylation Reactions of N-Boc-O-benzyl-2-aminophenols
作者:Alan Spivey、Olga Bodero
DOI:10.1055/s-0036-1588348
日期:——
A one-pot, tandem anionic cyclization/alkylationreaction of N-Boc-O-benzylated-2-aminophenols to give 2-aryl-1,4-benzoxazin-3-ones is described. The Boc protecting group plays a crucial role in the process, as the tert-butoxide liberated in the cyclisation step facilitates the benzylic deprotonation necessary for the subsequent alkylation. The reaction gives expedient access to a range of substitution