Naphthopyranquinone Antibiotics: Novel enantioselective syntheses of frenolicin B and some of its stereoisomers
作者:Thierry Masquelin、Urs Hengartnerb、Jacques Streith
DOI:10.1002/hlca.19970800104
日期:1997.2.10
Two new enantioselective syntheses of the naphthopyranquinone antibiotic frenolicin B (1), of its enantiomer 2, and of its diastereoisomers 3 and 4 were accomplished using two different routes from optically active β-Hydroxy esters (R)- and (S)-11 and 18. β-Hydroxy esters (R)- and (S)-11 were prepared stereoselectively from optically active sulfenylacetates (S)- and (R)-10, respectively (Scheme 2,
两种新的对映体选择性合成萘吡喃醌类抗生素苯酚联蛋白B(1),其对映异构体2以及其非对映异构体3和4的方法是使用两种不同的光学活性β-羟基酯(R)-和(S)-11和18.分别从光学活性的亚磺基乙酸酯(S)-和(R)-10立体选择性地制备β-羟基酯(R)-和(S)-11(方案2,方法A)。或者,化合物18通过使用手性钌络合物催化剂将相应的β-酮酯17进行对映选择性加氢,可以获得极好的收率(方案3,方法B)。随后,将化合物(S)-11和18转化为苯酚联蛋白B(1)。与此类似,由(S)-和(R)-11制备的立体异构体2-4的收率很高。