Total synthesis of Angucyclines. Part 18: A short and efficient synthesis of (+)-ochromycinone
作者:Karsten Krohn、Md.Hossain Sohrab、Ulrich Flörke
DOI:10.1016/j.tetasy.2003.12.028
日期:2004.2
enantiospecific (seven steps, 99% ee) synthesis of (+)-ochromycinone 2 in 19% overall yield is reported. Key steps are the regioselective Diels–Alder reaction of the juglone derivative 4 with the mixture of dienes 5 and 9 derived from 3-methylcyclohexanone (99% ee) and the photooxidation of 1-deoxyochromycinone 3 to the natural ketone 2. A pronounced concentration dependence of the specific rotation was
据报道,(+)-邻苯二甲酰胺2的短且高度对映体特异性(七个步骤,99%ee)的合成的总产率为19%。关键步骤是朱古隆衍生物4与衍生自3-甲基环己酮(99%ee)的二烯5和9的混合物的区域选择性Diels-Alder反应,以及1-脱氧铬霉素3的光氧化为天然酮2。对于在(CHCl 3)3中的(+)-邻苯二酚2,观察到了比旋光的明显的浓度依赖性。