Cytotoxic activity of (S)-goniothalamin and analogues against human cancer cells
摘要:
(R)- and (S)-Goniothalamin (1) and analogues 2-9 were efficiently prepared in high overall yield and enantiomeric purity, and their cytotoxic activities were evaluated against eight human cancer cell lines. A structure-activity relationship study (SAR) allowed us to establish the relevant structural features for the cytotoxic activity of goniothalamin analogues. In addition, we have identified non-natural form of goniothalamin (S)-1 and analogue 5 as the highest and more selective cytotoxic compounds against kidney cancer cell growth (786-0) with IC50 = 4 and 5 nM, respectively, and compound 8 (IC50 = 4 nM) as the more potent against breast cancer cells with resistance phenotype for adryamycin (c) 2005 Elsevier Ltd. All rights reserved.
Being selective: The catalyticallylation of α,β‐unsaturated aldehydes with allyltrichlorosilane in the presence of chiral 3,3′‐unsymmetrically substituted bis(tetrahydroisoquinoline) N,N‐dioxides was explored. The allylation of various aldehydes proceeded under mild reaction conditions (−78 °C) with high yields and enantioselectivity (see scheme). This allylation was applied in the synthesis of (
Tetrahydroisoquinoline-Based N-Oxides as Chiral Organocatalysts for the Asymmetric Allylation of Aldehydes
作者:Tricia Naicker、Per I. Arvidsson、Hendrik G. Kruger、Glenn E. M. Maguire、Thavendran Govender
DOI:10.1002/ejoc.201100923
日期:2011.12
The short synthesis of a series of novel chiral N-oxideorganocatalysts and their evaluation in the asymmetricallylation reaction of aromatic and α-β-unsaturated aldehydes with allyltrichlorosilane is reported. These readily modifiable organocatalysts are the first of their kind based on the tetrahydroisoquinoline framework. The chiral homoallyl products were obtained with good chemical efficiency