Synthesis of a Key Building Block for a Butyrolactone → 1,3-Diol Approach to the Polyol Part of Roflamycoin
作者:Diego Muñoz-Torrero、Reinhard Brückner
DOI:10.1002/(sici)1099-0690(199806)1998:6<1031::aid-ejoc1031>3.0.co;2-d
日期:1998.6
Monoepoxide 33 – also derived from dichlorodiol 12 – was ring-opened with the same Gilman cuprate affording compound 35. It was transformed into the correctly protected γ-lactone 6 in seven steps, key reactions being the ozonolysis 35 36 and the diastereoselective reduction 36 anti-37.
为了制备三(γ-内酯)3,从二氯二醇12(99.8%ee)合成单(γ-内酯)6。双环氧化物 9 – 衍生自二氯二醇 12 (99.8% ee) – 与来自 2-lithio-1,5-己二烯和 CuI 的 Gilman 铜酸盐开环,几乎完全得到单环氧化物 21;再经过五步,得到与目标分子6具有相同立体三联体但保护基不同的γ-内酯30。单环氧化物 33 - 也衍生自二氯二醇 12 - 用相同的吉尔曼铜酸盐开环,得到化合物 35。 它通过七个步骤转化为正确保护的 γ-内酯 6,关键反应是臭氧分解 35 36 和非对映选择性还原 36 反-37.