ASYMMETRIC SYNTHESIS OF ANTITUMOR AGENTS

这项研究建议反映了我们对 新试剂的开发及其在不对称 合成复杂的有机分子， 人类癌症的治疗 长期目标是 最终实现代表性的不对称合成， 新出现的安莎布里奇大环内酰胺类的成员 具有广泛的抗肿瘤和抗生素活性。 某些成员，麦白霉素-I和除莠霉素A已被证明 作为酪氨酸蛋白激酶的选择性抑制剂起作用。 在 在这方面，我们打算： 证明非对映体和对映体的效用 纯官能化的（E）-巴豆基硅烷试剂1，在手性 不对称的烯丙基硅烷基键构建方法 复杂有机分子合成。 具体来说， 与非手性芳基和脂肪族缩醛的选择性加成反应 将研究功能化的构建 高烯丙基醚 这些高烯丙基醚将被用作关键 用于构建先进的生物燃料的中间体， 安莎霉素天然产物的不对称合成。 抗肿瘤抗生素安莎霉素（+）-的全合成 macbecin I（2a），结构相关的全合成 除莠霉素A（2b）。 这些天然产物和结构相关 分子（合成中间体）将被评价为选择性 酪氨酸蛋白激酶抑制剂。该方法是基于 （2 R，3R）-1d对芳基缩醛的非对映选择性加成反应。 Trienomycin-A3 a和（+）-mycotirenin I的不对称合成 （3b）。 该方法是基于新方法的发展 用于不对称合成顺式和反式-1，3-二醇，并基于 两个连续的立体选择性反应：对映选择性加成 反式（E）-巴豆基硅烷（2S，3R）-1a转化为缩醛，然后是 面上等位基因酯转位。 本方案将 用于组装C11、C12和C13立体中心， 三烯霉素A和（+）-真菌替瑞宁-I。 我们将开始针对化学合成的研究 细胞毒性大环内酯类，乌拉内酯A和B，也称为 halichondramides 4a，b. 利用我们开发的手性 用于键不对称的基于巴豆基硅烷的键构造方法 C-C键形成反应用于合成抗- 高烯丙醇和反-1，3-二醇双酮， 乌拉普利的特征亚基。

This research proposal reflects our general interest in the development of new reagents and their use in the asymmetric synthesis of complex organic molecules that may have relevance in the treatment of human cancers. The long term objectives are the eventual achievement of the asymmetric synthesis of representative members of an emerging class of ansabridge macrocyclic lactams possessing a wide range of antitumor and antibiotic activity. Certain members, macbecin-I and herbimycin A have been shown to function as selective inhibitors of tyrosine protein kinase. In this regard we intend to: Demonstrate the utility of diasteromerically and enatimerically pure functionalized (E)-crotylsilane reagents 1, in chiral allylsilane-base bond construction methodology for the asymmetric synthesis of complex organic molecule. Specifically, diasteroface selective addition reactions with achiral aryl an aliphatic acetal will be investigated for the construction of functionalized homoallylic ethers. These homoallylic ethers will be used as key intermediates for the construction of advanced synthons in asymmetric synthesis of ansamycin natural products. The total synthesis of the ansamycin antitumor antibiotic (+)- macbecin I (2a), the total synthesis of structurally related herbimycin A (2b). These natural products and structurally related molecules (synthetic intermediates) will be evaluated as selective inhibitors of tyrosine protein kinases. The approach is based on the diasteroface selective addition of (2R,3R)-1d to aryl acetal. The asymmetric synthesis of trienomycin-A 3a and (+)-mycotirenin I (3b). The approach is based on the development of new methodology for the asymmetric synthesis syn-and anti-1,3-diols and is based on two sequential stereoselective reactions: enantioselective addition of the anti(E)-crotylsilane (2S,3R)-1a to an acetal followed by a suprafacial allelic ester transposition. This protocol will be used for the assembly of the C11, C12 & C13 sterocenters of trienomycin A and (+)-mycotirenin-I. We will begin studies directed at chemical synthesis of the cytotoxic macrolides, ulapualide A & B, other wise known as the halichondramides 4a,b. Utilizing our developing chiral crotylsilane based bond construction methodology for key asymmetric C-C bond forming reactions to be employed in the synthesis of anti- homoallylic alcohol and anti-1,3-diol synthons which are characteristic subunits of the ulapualides.