(7), which has been stereoselectively synthesised via the 4-methoxycarbonylisoxazoline (4), was converted into (±)-epithienamycins A (2) and B (3)[(±)-olivanic acids MM22380 and MM22382], (±)-deacetylepithienamycin A (20), and the 2-phenylthio-substituted compound (19). This total synthesis confirms the relative stereochemistry of the natural antibiotics.
已立体选择合成的(±)-(3 R *,4 R *)-4-(2,2-二甲氧基乙基)-3 [(1 S *)-1-羟乙基]氮杂
环丁烷-2-酮(7)通过4-甲氧基羰基
异恶唑啉(4)转化为(±)-上皮霉素A(2)和B(3)[(±)-寡酸MM22380和MM22382],(±)-脱乙酰基表艾霉素A(20)和2-苯
硫基取代的化合物(19)。该总合成证实了天然抗生素的相对立体
化学。