Synthesis and in vitro cytotoxicity of novel hydrophilic chiral 2-alkoxy-1,4-butanediamine platinum (II) complexes
摘要:
Twenty-six new hydrophilic chiral 2-alkoxy-1,4-butanediamine platinum (II) complexes having a seven-membered ring structure between a bidentate carrier ligand and a platinum atom have been synthesized and most of them were evaluated for their in vitro cytotoxicity toward A549 human non-small cell lung carcinoma and HCT-116 human colon cancer cell lines. The cytotoxicities of platinum complexes are related to the nature of the carrier ligand and leaving group. Complex 5'b, viz. cis-dichloro[(2R)ethoxy-1,4-butanediamine] platinum (11), exhibits the greatest potency among those 21 tested platinum complexes in both cell lines. (c) 2005 Elsevier Ltd. All rights reserved.
Enantio- and regioselective monohydrolysis of diethyl 2-ethoxysuccinate
摘要:
A procedure for the synthesis of (S)-ethyl 2-ethoxy-4-succinate 2 in 95% e.e. using a lipase from Candida rugosa was developed. The enzymatic reaction was highly selective for the secondary ester group and provided the desired (S)-monoacid in 40% yield. The unchanged (R)-diester was readily racemized and recycled.