Asymmetric synthesis of N,O,O,O-tetra-acetyl d-lyxo-phytosphingosine, jaspine B (pachastrissamine), 2-epi-jaspine B, and deoxoprosophylline via lithium amide conjugate addition
作者:Elin Abraham、E. Anne Brock、José I. Candela-Lena、Stephen G. Davies、Matthew Georgiou、Rebecca L. Nicholson、James H. Perkins、Paul M. Roberts、Angela J. Russell、Elena M. Sánchez-Fernández、Philip M. Scott、Andrew D. Smith、James E. Thomson
DOI:10.1039/b801671b
日期:——
The highly diastereoselective anti-aminohydroxylation of (E)-gamma-tri-iso-propylsilyloxy-alpha,beta-unsaturated esters, via conjugate addition of lithium (S)-N-benzyl-N-(alpha-methylbenzyl)amide and subsequent in situ enolate oxidation with (+)-(camphorsulfonyl)oxaziridine, has been used as the key step in the asymmetric synthesis of N,O,O,O-tetra-acetyl d-lyxo-phytosphingosine (20% yield over 7 steps)
(E)-γ-三异丙基甲硅烷氧基-α,β-不饱和酯的高度非对映选择性抗氨基羟基化反应,方法是共轭添加(S)-N-苄基-N-(α-甲基苄基)锂(+)-(樟脑磺酰基)恶唑烷的原位烯醇氧化已被用作N,O,O,O-四乙酰基d-lyxo-physphingosine的不对称合成的关键步骤(7步收率20%),脱水植物鞘氨醇茉莉B(9步中的收率为10%),2-表麻B(9步中的收率为14%)和Prosopis生物碱脱氧脯氨酸茶碱(7步中的收率为26%)。