作者:Johann Mulzer、Holger M. Kirstein、Juergen Buschmann、Christian Lehmann、Peter Luger
DOI:10.1021/ja00003a026
日期:1991.1
A convergent total synthesis (22 steps on the longest linear route) of (−)-erythronolide B (5) and two 9-dihydro derivatives (52 and 54) thereof from (R)-2,3-O-isopropylideneglyceraldehyde (20) as the only source of chirality is described. A key step of the synthesis is the regio- and stereocontrolled coupling of the allyl sulfide anion 39 and ketone 26 which can be directed to either α-adduct 40 or
(-)-erythronolide B (5) 及其两种 9-二氢衍生物(52 和 54)来自 (R)-2,3-O-异亚丙基甘油醛 (20) 的收敛全合成(最长线性路线上的 22 步)作为手性的唯一来源被描述。A key step of the synthesis is the regio- and stereocontrolled coupling of the allyl sulfide anion 39 and ketone 26 which can be directed to either α-adduct 40 or 41 by an appropriate choice of the conditions (Scheme V, table II). 由40和41制备seco酸47和49,根据改进的Yamaguchi程序将其顺利地大环内酯化为50和51。在大环立体控制下进行 50