Enantiospecific synthesis of the phospholipase A<sub>2</sub>inhibitors (−)-cinatrin C<sub>1</sub>and (+)-cinatrin C<sub>3</sub>
作者:Anthony N. Cuzzupe、Romina Di Florio、Jonathan M. White、Mark A. Rizzacasa
DOI:10.1039/b308028e
日期:——
chelation-controlled addition of a carbanion to alpha-hydroxy ketone 8. The best selectivity was achieved by use of the Grignard reagent derived from trimethylsilylacetylene. Transformation of the terminal alkyne into methyl ester 17 followed by acetal hydrolysis and selective lactol oxidation gave cinatrin C1 dimethyl ester (7). Base hydrolysis and acid induced relactonization then gave a 1:1 mixture
描述了从D-阿拉伯糖衍生物9的对映体特异性合成(-)cinatrin C1(3)和(+)-cinatrin C3(5)。C2的立体化学是通过向α-羟基酮8中螯合控制添加碳负离子来引入的。使用衍生自三甲基甲硅烷基乙炔的Grignard试剂可实现最佳选择性。将末端炔烃转化为甲酯17,然后进行乙缩醛水解和选择性的乳醇氧化,得到了cinatrin C1二甲基酯(7)。然后进行碱水解和酸诱导的再乳化作用,得到了1:1的桂皮素C1(3)和C3(5)混合物。