Diels-alder reactivity of 1-alkoxyphenyl-3-trialkylsiloxy-1,3-dienes
摘要:
The synthesis of 1-(3,4,5-trimethoxyphenyl)-3-trialkylsiloxy-1,3-butadienes and their Diels-Alder reaction with selected dienophiles at room temperature is described. These aryldienes are useful building blocks for the synthesis of natural and pharmacological active products, as has been shown by the preparation of a tetracyclic ketone needed for the synthesis of new anthracycline analogues. (C) 1997 Elsevier Science Ltd.
截瘫是非凋亡性细胞死亡,其特征在于大量内质网(ER)或线粒体来源的液泡。与依赖凋亡的抗癌药物相比,诱发上pt裂可为化疗耐药性肿瘤的治疗提供显着优势。由于某些天然生物碱可诱导麻痹性细胞死亡,因此合成了一系列新的苯并[ a ]喹诺唑烷衍生物,并对其抗增殖活性和诱导细胞质空泡的能力进行了分析。结构优化导致了强效化合物22b的鉴定,该化合物在体内外抑制癌细胞的增殖,并极大地促进了类麻痹样细胞的死亡并诱导了caspase依赖性细胞凋亡。进一步调查发现22b介导的空泡作用源自持续的内质网应激和LC3B的上调。因此,由苯并[ a ]喹啉嗪衍生物诱导的截瘫代表了癌症化学疗法的另一种策略。
Synthesis of (±)-7-(3,4,5-trimethoxyphenyl)-7-deoxyidarubicinone. A new family of anthracycline analogues
作者:Esther Caballero、Manuel Medarde、Rafael Pelaez-Lamamie de Clairac、Heidi Sahagún、Fernando Tomé
DOI:10.1016/s0040-4020(98)00304-4
日期:1998.5
The synthesis of the first representative compound of 7-aryl anthracycline analogues, is described. 1-Alkyl-3-trialkylsiloxydienes, prepared from readily available materials, are transformed through a Diels-Alder cycloaddition into a tetracyclic ketone, that is converted into (±)-7-(3,4,5-trimethoxyphenyl)-7-deoxyidarubicinone. The conformations of the target compound and intermediate products are