Asymmetric Total Synthesis of (11R, 12S, 13S, 9Z, 15Z)-9, 12, 13-Trihydroxyoctadeca-9, 15-dienoic Acid, a self-defensive agent against rice-blast disease
作者:Alain Baudat、Pierre Vogel
DOI:10.1002/hlca.19940770605
日期:1994.9.21
the corresponding aldehyde which was condensed with the ylide derived from triphenyl-(propyl)phosphonium bromide to give (1R, 2S, 3S, 4S)-1-[(tert-butyl)dimethylsilyloxy]tetrahedro-2, 3-(isopropyl-idenedioxy)-4-[(Z)-pent-2′ -enyl]furan ((+)-7). Removal of the silyl protective group gave a mixture of the corresponding furanose that underwent Wittig reaction with the ylide derived from [8-(methoxycarb
的狄尔斯-阿尔德呋喃和1-氰基乙烯基(1'的加合物- [R)-camphanate转化为甲基[(叔丁基)二甲基甲5-脱氧-2,3- ö异亚丙基β-L-核糖-hexofuranosid]尿酸盐((+)- 4)。用二异丁基铝氢化物还原,得到相应的醛,将其与衍生自三苯基-(丙基)溴化phosph的内鎓盐缩合,得到(1 R,2 S,3 S,4 S)-1-[(叔丁基)二甲基甲硅烷氧基] tetrahedro-2,3-(异丙基-二烯二氧基)-4-[(Z)-pent-2'-烯基]呋喃((+)- 7)。除去甲硅烷基保护基团得到相应的呋喃糖的混合物,其与[8-(甲氧基羰基)-辛基]三苯基溴化derived衍生的叶立德进行了维蒂希反应,得到甲基(11 R,12 S,13 S,9 Z,15 Z)-13-羟基-11,12-(异亚丙基-二氧基)十八烷基-9,15-二烯酸酯((-)- 9)。酸性水解,然后皂化,得到(11