Enones of formulae Ia-d undergo cyclization to give stereoselectively the enol esters IIa-d, respectively, IIa-d are suitable synthones for some sesquiterpene syntheses .— In this paper the synthesis of torreyol (1) is described by an all step stereocontrolled reaction sequence: cyclization educt 10 (Ic) was prepared by alkylation of 8 with 5 and enol ether cleavage of 9. The reaction sequence 11a
式Ia-d的烯酮进行环化反应立体选择性地得到烯醇酯IIA-d分别IIA-d是用于一些合成
倍半萜合适synthones .-本文torreyol(合成1)由所有步骤立体控制反应描述序列:环化离析物10(Ic)的制备方法是:将5与8进行烷基化,对9进行烯醇醚裂解。反应顺序11a(IIc)→14a 15 → 18(酯
水解,形成叔醇,异
丙烯基降解),然后氧化,生成酮19其相对构型由2D J分辨的400
MHz 1 H NMR光谱确定。在C-8(22 → 23)处甲基化后,
甲苯磺酰hydr 25进行Bamford-Stevens反应,生成(±)-1。