Stereoselective Synthesis of Structurally Simplified Cephalostatin Analogues by Multiple Heck Reactions and Their Biological Evaluation
作者:Lutz F. Tietze、Wolf-Rüdiger Krahnert
DOI:10.1002/1521-3765(20020503)8:9<2116::aid-chem2116>3.0.co;2-4
日期:2002.5.3
heptacyclic cephalostatin analogues 2, 3, 18-21, 31, 32 and 33 by multiple Heck reactions is described. The key step of the synthesis is a selective Heck reaction of hydrindene 7 with 12 and 25, respectively at the vinyl bromide moiety followed by the introduction of a second molecule of 7 and a twofold intramolecular Heck reaction. The obtained bissteroidal heptacyclic compounds 2 and 3, in which the
描述了通过多个Heck反应立体简化合成的结构简化的七环头孢抑素类似物2、3、18-21、31、32和33。合成的关键步骤是分别在乙烯基溴部分上将茚7与12和25进行选择性Heck反应,然后引入第二个7分子和两倍分子内Heck反应。所获得的双甾体七环化合物2和3中的1的中央八氢吩嗪部分被苯环取代,它们含有两个新生成的环的不寻常的顺环。在HTFCA测试中确定了某些衍生物对人肺癌细胞系A 549的细胞毒性(人类肿瘤菌落形成能力)。它们在微摩尔范围内表现出相当高的ED(50)活性。