New synthesis of 5-amino-4-hydroxy-2,6-dimethylheptanoic acid, a hydroxyethylene isostere of the Val-Ala dipeptide
作者:Fabio Benedetti、Paolo Maman、Stefano Norbedo
DOI:10.1016/s0040-4039(00)01773-1
日期:2000.12
Two stereoisomers of the title compound have been synthesized from the methyl ester of N-Boc L-valine. The aminoester was initially converted into an α′-amino α,β-unsaturated ketone via a phosphonoketone and a Horner–Emmons olefination with acetaldehyde. Hydrocyanation of the enone with diethylaluminium cyanide and functional group conversions gave the hydroxyaminoacids protected as oxazolidines or
由N -Boc L-缬氨酸的甲酯合成了标题化合物的两种立体异构体。最初,氨基酯通过膦酰基酮和Horner-Emmons与乙醛的烯化反应转变为α'-氨基α,β-不饱和酮。用二乙基氰化铝进行烯酮的氢氰化和官能团的转化,得到了被保护为恶唑烷或内酯的羟基氨基酸。