Synthesis of a New (1<i>R</i>)-(−)-Myrtenal-Derived Dioxadithiadodecacycle and Its Use as an Efficient Chiral Auxiliary
作者:M. Elena Vargas-Díaz、Pedro Joseph-Nathan、Joaquín Tamariz、L. Gerardo Zepeda
DOI:10.1021/ol062319f
日期:2007.1.1
[reaction: see text] The new macrocycle 9 (>70% yield from hydroxythiol 10) was treated with several nucleophilic reagents (RMgX, RLi, and LiAlH4) affording carbinols 12a-j (80-96% yield, >99:1 dr). Oxidative hydrolysis of 12a,c,e, followed by LiAlH4 reduction of the resulting mixture, gave 16a,c,e in >95% ee,16c being a key precursor for the preparation of fungicide 17. The absolute configuration
[反应:请参见文本]用几种亲核试剂(RMgX,RLi和LiAlH4)处理了新的大环化合物9(羟基硫醇10的产率> 70%),得到甲醇12a-j(产率80-96%,> 99:1 dr )。12a,c,e的氧化水解,然后将所得混合物进行LiAlH4还原,得到> 95%ee,16c的16a,c,e,这是制备杀菌剂17的关键前体。9和12j的绝对构型( Nu = H)是通过单晶X射线衍射分析和化学相关性建立的。