Brønsted and Lewis Base Behavior of Sodium Amidotrihydridoborate (NaNH
<sub>2</sub>
BH
<sub>3</sub>
)
作者:Xi‐Meng Chen、Huizhen Li、Qiu‐Yu Yang、Rui‐Rui Wang、Ewan J. M. Hamilton、Jie Zhang、Xuenian Chen
DOI:10.1002/ejic.201700556
日期:2017.10.25
The reactivity of sodium amidoborane (NaNH2BH3) as a Bronsted and Lewis base was studied systematically. The [NH2BH3]– anion can act as a proton acceptor or a hydride donor in different types of reactions. In reactions with very weak Bronsted acids such as cyclopentadiene, ammonia, and pyrazole, the [NH2BH3]– anion acts as a proton acceptor through the lone pair on N. The reactions of [NH2BH3]– with
The invention relates to novel compounds of formula (I), and their pharmaceutically acceptable salts, as defined herein, processes and intermediates for their preparation, pharmaceutical formulations comprising the novel compounds of formula (I), and the use of the compounds of formula (I) as thrombin inhibitors.
and trifluoromethyl group. Using the ester method, acid chlorides, or Mukaiyama's procedure, the 5-(methylsulfonyl)benzoic acid derivatives were finally converted to the (5-(methylsulfonyl)benzoyl)guanidines 165-267 with excessive guanidine. In some cases nucleophilic substitutions with pyridinols and piperidine derivatives were carried out at the end of the reaction sequence with the 4-halo-N-(diami
已显示在心脏缺血和再灌注期间抑制Na + / H +交换剂有利于保存细胞完整性和功能性能。本研究的目的是提出有效和选择性的苯甲酰胍作为NHE抑制剂,以用作辅助治疗急性心肌梗塞。在我们的研究过程中,很明显,邻位酰基胍的取代对于化合物的效力至关重要。使用定向原位金属化技术,以羧酸为导向基团,制备了4-氯-和4-氟-2-甲基苯甲酸6和7。使用LDA /甲基碘系统,可以将2-甲基延伸至乙基。通过钯催化的交叉偶联反应将4-烷基插入4-溴-2-甲基苯甲酸甲酯(20)。从苯甲酸6-19开始,通过一系列标准反应(磺基氯化,还原和甲基化)引入甲基磺酰基。通过钯催化的Suzuki反应合成了4-芳基衍生物68-75。用S-,O-和N-亲核试剂以及氰基和三氟甲基进行了4-位的大量亲核取代反应。使用酯法,酰氯或Mukaiyama方法,最终将5-(甲基磺酰基)苯甲酸衍生物与过量的胍转化为(5-(甲基磺酰基)苯甲酰基)
Synthesis of Optically Active α-Trifluoromethylamines by Rearrangement of β-Amino-α-trifluoromethyl Alcohols
作者:Zeina Neouchy、Domingo Gomez Pardo、Janine Cossy
DOI:10.1021/acs.orglett.8b02353
日期:2018.10.5
The synthesis of various opticallyactive α-trifluoromethylamines has been realized from β-amino-α-trifluoromethyl alcohols via an aziridinium ion intermediate under kinetic conditions.
The synthesis of some binuclear ruthenium(I) complexes bridged by anionic groups. X-ray structures of pyrazolate- and oxypyridinate-bridged complexes
作者:Stephen J. Sherlock、Martin Cowie、Eric Singleton、Margot M. de V. Steyn
DOI:10.1016/0022-328x(89)87007-x
日期:1989.2
A series of binuclear ruthenium(I) complexes, [Ru2(CO)4(μ-XY)2(PPh3)2], have been prepared by two closely related routes. Complexes 2 (XY− = S2NC3H4−) and 3 (XY− = NC5H4O−) have been prepared by the reaction of [Ru2(CO)4(O2-CCH3)2(PPh3)2] with sodium 2-mercaptothiazolinate and sodium 2-oxypyridinate, respectively. The related pyrazolate-bridged complex 4 (XY−=N2C3H3−) was prepared by the reaction of