Methanol as hydrogen source: Chemoselective transfer hydrogenation of α,β-unsaturated ketones with a rhodacycle
作者:Ahmed H. Aboo、Robina Begum、Liangliang Zhao、Zahoor H. Farooqi、Jianliang Xiao
DOI:10.1016/s1872-2067(19)63367-x
日期:2019.11
economic and easy-to-handle hydrogen source. It has rarely been used in transfer hydrogenation reactions, however. We herein report that a cyclometalated rhodium complex, rhodacycle, catalyzes highly chemoselectivehydrogenation of α,β-unsaturatedketones with methanol as the hydrogen source. A wide variety of chalcones, styryl methyl ketones and vinyl methyl ketones, including sterically demanding
A Schmidt rearrangement-mediated synthesis of novel tetrahydro-benzo[1,4]diazepin-5-ones as potential anticancer and antiprotozoal agents
作者:Daniel Insuasty、Sara M. Robledo、Iván D. Vélez、Paola Cuervo、Braulio Insuasty、Jairo Quiroga、Manuel Nogueras、Justo Cobo、Rodrigo Abonia
DOI:10.1016/j.ejmech.2017.10.024
日期:2017.12
NaN3/H2SO4 reaction conditions. Twelve of the obtained compounds were in vitro screened by the US National Cancer Institute (NCI) for their ability to inhibit 60 different human tumor cell lines, where compound 24a presented a remarkable activity against 58 of the 60 cancer cell lines, with the most important GI50 values ranging from 0.047 to 8.16 μM and LC50 values ranging from 9.4 to > 100 μM. Additionally
通过施密特重排反应,由相应的1,2,3,4-tetrahydro-4合成了新颖的四氢-5 H-苯并[ e ] [1,4]二氮杂5-5-酮,其中几个含有喹啉药效团。NaN 3 / H 2 SO 4反应条件介导的喹诺酮类药物。美国国家癌症研究所(NCI)在体外筛选了十二种获得的化合物抑制60种不同人类肿瘤细胞系的能力,其中化合物24a对60种癌细胞系中的58种表现出显着的活性,其中最重要的是GI 50值范围从0.047至8.16μM和LC 50值范围从9.4到> 100μM。此外,其中一些被评估为抗疟药,抗锥虫病药和抗疟药。化合物22g 对恶性疟原虫的最佳抗疟疾反应为EC 50 = 13.61μg/ mL ,而化合物24d对克氏锥虫则表现出高活性。和Leishmania(V)panamensis的EC 50分别 为2.78μg/ mL和3.35μg/ mL。
作者:Narayanasamy Nivetha、Reshma Mary Martiz、Shashank M. Patil、Ramith Ramu、Swamy Sreenivasa、Sivan Velmathi
DOI:10.1039/d2ra04452h
日期:——
stereoselective, three-component method has been developed to synthesize pyrrolidine and pyrrolizidine containing spirooxindole derivatives. The interaction between the dipolarophile α,β-unsaturated carbonyl compounds and the dipole azomethine ylide formed in situ by the reaction of 1,2-dicarbonyl compounds and secondary amino acids is referred to as the 1,3-dipolarcycloaddition reaction. The reaction
已经开发了一种高度立体选择性的三组分方法来合成含有螺氧吲哚衍生物的吡咯烷和吡咯里西啶。亲偶极α,β-不饱和羰基化合物与1,2-二羰基化合物与仲氨基酸反应原位形成的偶极甲亚胺叶立德之间的相互作用称为1,3-偶极环加成反应。优化反应条件以实现优异的立体选择性和区域选择性。更短的反应时间、简单的后处理和优异的产率是本方法的显着特征。化合物6i的一个例子的各种光谱方法和单晶 X 射线衍射检查验证了预期产物的立体化学。针对α-葡萄糖苷酶和α-淀粉酶测试了新合成的螺氧吲哚衍生物的抗糖尿病活性。发现化合物6i对 α-葡糖苷酶和 α-淀粉酶具有有效的抑制活性,分子对接研究进一步证明了这一点。