Stereoselective Rhodium-Catalyzed Conjugate Addition of Boronic Acids to Unprotected δ-Hydroxy-γ-butenolides. Synthesis of (−)-7-Oxamuricatacin and β-Substituted Derivatives
作者:Cristina Navarro、Ana Moreno、Aurelio G. Csákÿ
DOI:10.1021/jo8022395
日期:2009.1.2
The chiral δ-hydroxy-γ-butanolide moiety is widely found among biologically active natural products. We report herein the stereoselective synthesis of β-substituted analogues of these compounds by the RhI-catalyzed conjugateaddition of boronic acids to chiral δ-hydroxy-γ-butenolides, easily prepared from the chiralpool. The reaction takes place with high trans diastereoselectivity without protection
在生物活性天然产物中广泛发现手性δ-羟基-γ-丁醇化物部分。我们在本文中报道了这些化合物的β-取代的类似物的立体选择性合成,该合成是通过将Rh I催化的硼酸共轭加成到手性的δ-羟基-γ-丁烯酸内酯,可以很容易地从手性库中制备。该反应以高反式非对映选择性进行,而没有保护羟基。(-)-7-草酸卡他霉素(R 1 = H,R 2 = CH 2 -O- n C 10 H 21)和新的β-取代的7-草酸卡他霉素类似物(R 1 =芳基,乙烯基)的三步合成)被报告。