An efficient, asymmetric synthesis of the cytotoxic natural product chaetominine was achieved in 14 steps. The strategy employs a copper(I)-mediated cyclization reaction as a key step to install the abc-tricyclic ringsystem, which was further elaborated by diastereoselective oxidation and reduction reactions. This effort also documents the firstexample of an oxidative rearrangement yielding to homochiral
The tricyclic hydroxy imidazolidinone was converted to chaetominine in seven steps in 22% overall yield. The key step was the construction of the delta-lactam by heating an amino ester with a catalytic amount of DMAP in toluene at reflux.
Second-Generation, Biomimetic Total Synthesis of Chaetominine
A straightforward total synthesis of the potent anticancer agent (-)-chaetominine is reported. Central to this synthesis was a biomimetic oxidative cyclization of a tryptophanyl-alanine dipeptide, which provided a fully elaborated 1,2,3,4-tetrahydropyrido[2,3-b]indole. Reduction of this intermediate followed by spontaneous cyclization and installation of the side chain provided synthetic chaetominine
报道了有效的抗癌药(-)-chaetominine的直接全合成。该合成的中心是色氨酸-丙氨酸二肽的仿生氧化环化,其提供了充分加工的1,2,3,4-四氢吡啶并[2,3- b ]吲哚。还原该中间体,然后自发环化并安装侧链,从商业上可得的廉价起始原料开始,以九个步骤的顺序以9%的总收率提供了合成的树脂胺。 生物碱-全合成-氧化环化-抗癌剂-肽
Synthesis and bioactivity studies of covalent inhibitors derived from (-)-Chaetominine
We reported herein the synthesis and bioactivity studies of compounds derived from the natural product (-)-Chaetominine (6). The key feature of these compounds is the incorporation of electrophilic groups that are capable of forming covalent bonds with the cysteine or threonine residues of cellular proteins. The cell growth inhibition activities of these derivatives of 6 were tested in four cancer
我们在此报道了源自天然产物 (-)-Chaetominine ( 6 )的化合物的合成和生物活性研究。这些化合物的关键特征是结合了能够与细胞蛋白质的半胱氨酸或苏氨酸残基形成共价键的亲电子基团。在四种癌细胞系中测试了6的这些衍生物的细胞生长抑制活性,即白血病细胞系K562、多发性骨髓瘤细胞系MM1.S、急性髓性白血病细胞系MV4-11和结肠癌细胞系RKO。数据显示细胞生长抑制 IC 50值为29,一种含丙烯酰胺的分子,比6 的IC 50值高9-17 倍。,而其他含丙烯酰胺的化合物的效力要低得多,这表明29可能与细胞靶蛋白有共价相互作用。总的来说,将丙烯酰胺部分并入6是提高其在癌细胞系中的细胞生长抑制活性的好策略。