A CuI -mediated coupling of the northern and southern units and a ring-size selective macrolactonization are the key steps in the convergent, first totalsynthesis of apoptolidinone, the aglycon of the potential antitumor compound apoptolidin. (The wavey lines in the picture are the retrosynthetic disconnections.).
Cu I介导的北部和南部单元的偶联以及环大小的选择性大环内酯化是会聚的,首先是全合成的细胞凋亡素,潜在的抗肿瘤化合物细胞凋亡素的糖苷配基的关键步骤。(图片中的波浪线是逆合成断裂。)
A convenient reagent for aldehyde to alkyne homologation
作者:Douglass F. Taber、Sha Bai、Peng-fei Guo
DOI:10.1016/j.tetlet.2008.09.114
日期:2008.11
A convenient reagent for the one-carbon homologation of an aldehyde to the corresponding alkyne is reported. This reagent allows this conversion to conveniently be carried out on a large scale under ambient conditions. (c) 2008 Elsevier Ltd. All rights reserved.
Apoptolidinone A: Synthesis of the Apoptolidin A Aglycone
An efficient stereocontrolled synthesis of apoptolidinone A, the aglycone of apoptolidin A is described. The synthetic strategy relies on a cross coupling between C11/C12 of a northern half (C1-C11) and a southern part (C12-C28) followed by a ring-size selective macrolactonization. Key steps for the introduction of the southern half stereocenters are a stereoselective aldol reaction, a substrate controlled