The intermediates 3 and 4, useful in the preparation of new biologically active bafilomycin derivatives, were obtained via a thermal retro-aldol reaction in diphenyl ether. The starting materials 5 and 7 for the retro-aldol reaction were synthesized in a few steps from bafilomycin C-1 (2) with or without a protective group at 7-OH. (C) 1999 Elsevier Science Ltd. All rights reserved.
Diastereoselective aldol reactions of β-silyloxy ethyl ketones. Application to the total synthesis of bafilomycin A1
作者:David A. Evans、Michael A. Calter
DOI:10.1016/s0040-4039(00)91817-3
日期:1993.10
toward the C17C18 aldol bond construction in the macrolide antibiotic bafilomycin A1 are described. The effect of the β-substituent in the aldolreactions of α-unsubstituted enolates is documented for various model compounds. The stereoselectivity of this process is critically dependent on the C21 and C23 oxygen protecting groups. Application of this methodology to the synthesis of bafilomycin A1 is
朝向与c定向研究17 C 18在大环内酯抗生素巴弗洛霉素甲羟醛键结构1进行说明。对于各种模型化合物,已证明了β-取代基在α-未取代的烯醇酸酯的醛醇缩合反应中的作用。该方法的立体选择性主要取决于C 21和C 23氧保护基。报道了该方法在合成bafilomycin A 1中的应用。
Retro-aldol cleavage of bafilomycin derivatives
作者:Kenneth L. Granberg、Karin M. Edvinsson、Kristina Nilsson
DOI:10.1016/s0040-4039(98)02365-x
日期:1999.1
The intermediates 3 and 4, useful in the preparation of new biologically active bafilomycin derivatives, were obtained via a thermal retro-aldol reaction in diphenyl ether. The starting materials 5 and 7 for the retro-aldol reaction were synthesized in a few steps from bafilomycin C-1 (2) with or without a protective group at 7-OH. (C) 1999 Elsevier Science Ltd. All rights reserved.