Asymmetric Syntheses of APTO and AETD: the β-Amino Acid Fragments within Microsclerodermins C, D, and E
作者:Stephen G. Davies、Ai M. Fletcher、Emma M. Foster、James A. Lee、Paul M. Roberts、James E. Thomson
DOI:10.1021/jo302731m
日期:2013.3.15
Efficient asymmetric syntheses of APTO and AETD, the highly functionalized β-amino acid fragments within microsclerodermins C, D, and E, are reported. The conjugate addition of lithium (R)-N-benzyl-N-(α-methylbenzyl)amide to tert-butyl (E,E)-7-(triisopropylsilyloxy)hepta-2,4-dienoate and in situ enolate oxidation with (−)-camphorsulfonyloxaziridine, diastereoselective dihydroxylation of a 2,3-syn-γ
报道了有效的APTO和AEDT的不对称合成,这是微菌皮蛋白C,D和E中高度官能化的β-氨基酸片段。将(R)-N-苄基-N-(α-甲基苄基)酰胺共轭加成到(E,E)-7-(三异丙基甲硅烷氧基)庚2,4-二烯酸叔丁酯中,并通过( −)-樟脑磺酰氧氮丙啶,2,3-顺-γ,δ-不饱和-α-羟基-β-氨基酯衍生物的非对映选择性二羟基化和朱莉娅-科辛斯基的烯化反应是关键步骤。