The synthesis of a conformationally restricted analog of acetolactate 1, a natural substrate for ketol acid reductoisomerase, is described. The key features of the successful synthesis are epoxidation of unsaturated ester 10 using urea-hydrogen peroxide complex and subsequent rearrangement of epoxide 11 to allylic alcohol 13 with aluminum tri-tert-butoxide. Compound 1 was neither a substrate for ketol acid reductoisomerase nor an inhibitor of the enzyme at concentrations up to 50 ppm.
本文介绍了乙酰
乳酸 1(
酮酸还原异构酶的天然底物)构象受限类似物的合成。成功合成的主要特征是使用
脲-
过氧化氢复合物对不饱和酯 10 进行环氧化,然后用三
叔丁醇铝将
环氧化物 11 重排为烯丙基醇 13。化合物 1 既不是
酮酸还原异构酶的底物,也不是该酶的
抑制剂,浓度高达 50 ppm。