摘要:
The four stereoisomers of Brz220 (2RS,4RS-1-[4-propyl-2-(4-trifluoromethylphenyl)-1,3-dioxolan-2-ylmethyl]-1H-1,2,4-triazole), a novel brassinosteroid biosynthesis inhibitor. were separated by silica gel column chromatography and chiral high-performance liquid chromatography (HPLC). The absolute configuration of each stereoisomer was determined by a combination of asymmetric synthesis and NMR analysis. The effects of these stereoisomers on cress stem elongation clearly indicate that the (2S)-isomer has the greatest inhibitory activity. (C) 2002 Elsevier Science Ltd. All rights reserved.