Amberlyst A 21 as New and Efficient Surface Catalyst for the Cleavage of 2-Nitrocycloalkanones
作者:Roberto Ballini、Marino Petrini、Valeria Polzonetti
DOI:10.1055/s-1992-26106
日期:——
Ring cleavage of 2-Nitrocycloalkanones with methanol/Amberlyst A 21 gave methyl Ï-nitroalkanoates, O2NCH2(CH2)nCO2Me where n = 3-6, 8-10, 13, in high yield. Subsequent Nef reaction gave the corresponding Ï-oxo compounds which were isolated, in the case of methyl 7-oxoheptanoate and methyl 8-oxooctanoate only, or reduced directly with sodium borohydride to give Ï-hydroxyalkanoates. A new formal synthesis of exaltolide (15-pentadecanolide) is also reported.
甲醇/Amberlyst A 21 条件下,2-硝基环烷酮的开环裂解反应高产率地生成了甲基 ƴ-硝基烷酸酯,其中 O2NCH2(CH2)nCO2Me(n = 3-6, 8-10, 13)。随后的 Nef 反应得到相应的 ƴ-氧代化合物,这些化合物被分离出来,仅限于甲基 7-氧代庚酸酯和甲基 8-氧代辛酸酯,或者直接用硼氢化钠还原得到 ƴ-羟基烷酸酯。此外,还报道了一种 exaltolide(15-十五烷酸内酯)的新型正式合成方法。