Towards a total synthesis of ustiloxins A & B. Stereocontrolled synthesis of (2S,4S,6S)-4-hydroxy-5-phenylsulfinylnorvaline
作者:Craig A. Hutton、Jonathan M. White
DOI:10.1016/s0040-4039(97)00110-x
日期:1997.3
A short, stereocontrolled synthesis of (2S,4S,6S)-4-hydroxy-5-phenylsulfinylnorvaline (8), an unusual amino acid component of ustiloxins A & B, has been achieved. Stereoselective bromolactonisation of N-Boc-(S)-allylglycine (3) is followed by substitution of the bromide 4a with thiophenol to give the corresponding sulfide 5. Highly stereoselective oxidation of the sulfide 5 gives the corresponding
已经实现了简短的,立体控制的合成,合成了(2 S,4 S,6 S)-4-羟基-5-苯基亚磺酰基正缬氨酸(8),这是UStiloxins A和B的不常见氨基酸成分。N-Boc-(S)-烯丙基甘氨酸(3)的立体选择性溴内酯化,然后用硫酚取代溴化物4a,得到相应的硫化物5。硫化物5的高度立体选择性氧化得到相应的亚砜6a。除去Boc基团和内酯开环,然后完成异常氨基酸的合成。