Proof of the Absolute Configuration of (?)-(S)-2-Hydroxy-?-ionone by correlation with ursolic acid and with (?)-trans-verbenol
作者:Sina Escher、Wolfgang Giersch、G�nther Ohloff
DOI:10.1002/hlca.19810640402
日期:1981.6.10
(−)-(S)-2-Hydroxy-β-ionone (33), (+)-(2 S, 6 S)-2-hydroxy-α-ionone (34), and their acetates 35 and 36 have been synthesized from (+)-(S)-6-methylbicyclo [4.3.0]-non-1-ene-3, 7-dione (3). The key intermediate (+)-(1 R, 3 S, 6 S)-2, 2, 6-trimethyl-7-oxobicyclo [4.3.0]non-3-yl acetate (7) was correlated with a degradation product of the pentacyclic triterpene ursolic acid (16). Compound 33 was also synthesized
(-)-(S)-2-羟基-β-紫罗兰酮(33),(+)-(2S,6S)-2-羟基-α-紫罗兰酮(34),其乙酸盐35和36为由(+)-(S)-6-甲基双环[4.3.0]-非-1-烯-3,7-二酮(3)合成。关键中间体(+)-(1 R,3 S,6 S)-2,2,6-三甲基-7-氧代双环[4.3.0]壬-3-基乙酸酯(7)与降解产物相关五环三萜乌索酸(16)。化合物33也通过从(-)-开始的替代途径合成。反式-马鞭草酚(42)。