有效获得具有药用价值的天然产品是药物开发的重要基础。海洋天然产物的有限供应妨碍了广泛的生物学评估。尽管已经报道了(-)-Lasonolide A的几种优美的合成方法,但这种有效的抗癌聚酮化合物的实用合成方法仍然难以捉摸。基于硼烷作为无痕保护基的应用以及空前的双砜试剂用于Julia烯化的发展,通过立体选择性加氢硼化,烯丙基化和氧化,以对映体收敛的方式组装了(-)-lasonolide A. 这种简洁的途径可以为访问派生词和类似物提供现实的解决方案。
An Efficient Stereoselective Synthesis of Penaresidin A from (<i>E</i>)-2-Protected Amino-3,4-unsaturated Sulfoxide
作者:Sadagopan Raghavan、V. Krishnaiah
DOI:10.1021/jo9022638
日期:2010.2.5
asymmetric synthesis of penaresidin A is disclosed. A β-protected amino-γ,δ-unsaturated sulfoxide was prepared by stereoselective addition of the lithio anion of (R)-methyl p-tolyl sulfoxide to an unsaturated sulfinylimine. The pendant sulfoxide group was used as an intramolecular nucleophile to functionalize an alkene regio- and stereoselectively to furnish a bromohydrin, which was employed as the key intermediate
Thiacalix[4]arene ionophores comprised of cyclic or linear O,S,N ligating and/or π-coordinate groups on the lower rim were synthesized and their Ag+ binding was studied by 1H NMR methods in comparison with the respective known and novel calix[4]arene counterparts. Calix[4](O,S,N)crowns were found stronger binders than the π-coordinate molecules and thiacalixarene ionophores were generally superior
合成了在下部边缘由环状或线性O,S,N连接和/或π坐标基团组成的Thiacalix [4]芳烃离子载体,并通过1 H NMR方法与各自已知的和新颖的相比,研究了它们的Ag +结合杯[4]芳烃同行。发现杯Calix [4](O,S,N)冠比π坐标分子更强的结合剂,而噻杯芳烃离子载体通常优于杯芳烃。这项研究有助于开发在亚纳摩尔级区域工作的银离子选择性电极。