Total Synthesis of Cryptophycins via a Chemoenzymatic Approach
作者:Grzegorz M. Salamonczyk、Kang Han、Zhi-wei Guo、Charles J. Sih
DOI:10.1021/jo960972i
日期:1996.1.1
A highly convergent synthesis of cryptophycins in their enantiomerically-pure forms was achieved. Our strategy consists of the synthesis of the two units 3 and 4 and linking them together to form the macrocyclic ring. The upper unit 3 was prepared from 10 in four steps, and the lower unit 4 was prepared from 20 in three steps. Enantioselective biocatalytic methodology was used to prepare the requisite chiral building blocks, (R)-11 and (R)-19. The stereochemical versatility of this synthetic approach is demonstrated by the synthesis of cryptophycin A and the four diastereomers of cryptophycin C.
Total Synthesis of Cryptophycins. Revision of the Structures of Cryptophycins A and C
作者:Russell A. Barrow、Thomas Hemscheidt、Jian Liang、Seunguk Paik、Richard E. Moore、Marcus A. Tius
DOI:10.1021/ja00114a011
日期:1995.3
The convergent total synthesis of cryptophycins C and D is described. It has been shown that in both natural products the absoluteconfiguration of the a-amino acid corresponds to the D-series. The structural assignment for cryptophycin C has been corrected to reflect this fact. Since the structure of cryptophycin A has been correlated to cryptophycin C, the chloro-0-methyltyrosine unit in cryptophycin
描述了隐霉素 C 和 D 的收敛全合成。已经表明,在两种天然产物中,α-氨基酸的绝对构型对应于 D 系列。已更正了隐藻素 C 的结构分配以反映这一事实。由于隐藻素A的结构与隐藻素C相关,隐藻素A中的氯-0-甲基酪氨酸单元具有D-构型。隐藻素是与陆生蓝绿藻 Nostoc sp. 相关的强效肿瘤选择性细胞毒素。GSV 224' 和 Nostoc sp。ATCC 53789.2 每种藻类中的主要细胞毒素,cryptophycin A,对植入小鼠的实体瘤(包括耐药性肿瘤)显示出极好的活性。超过 20 种相关的细胞毒素作为次要成分存在于 GSV 224 菌株中,以及这些化合物中的一些,例如,隐藻素 B 和 C,已被分离出足够的量用于体内评估。~为了获得足够数量的选定天然存在的隐藻素和合成类似物,用于构效关系 (SAR) 研究、临床前评估和人类临床试验,我们设计了一个通用的合成。正如原始论文中所述,Cryptophycins