Diastereoselective Transformations of Enol Esters Derived from Acetylenes and Chiral Carboxylic Acids
作者:Zbigniew Czarnocki、Iwona Kalinowska、Joanna Szawkało、Krzysztof Krawczyk、Jan Maurin
DOI:10.1055/s-0030-1260416
日期:2011.6
Markovnikov-type enol esters are synthesized selectively from N-protected amino acids by ruthenium-mediated coupling with the appropriate acetylenes. Subsequent hydrogenation of the enol esters over Adams’ catalyst gives the corresponding saturated products in moderate to good diastereoselectivities. The enol esters undergo reaction with m-chloroperoxybenzoic acid to yield α-acyloxy ketones, as the
Markovnikov型烯醇酯是通过N-保护的氨基酸通过钌介导的与适当乙炔的偶联选择性合成的。随后在Adams催化剂上氢化烯醇酯,得到中等至良好非对映选择性的相应饱和产物。烯醇酯经历与反应米氯过氧酸,得到α -酰氧基酮,作为重排的产物,而不是预期的环氧化物。 烯醇酯-非对映选择性-氢化-环氧化-钌