作者:Gregory B. Dudley、Douglas A. Engel、Ion Ghiviriga、Hubert Lam、Kevin W. C. Poon、Jeananne A. Singletary
DOI:10.1021/ol070992e
日期:2007.7.1
The synthesis of (+)-dihydro-epi-deoxyarteannuin B (3) from (-)-isopulegol is described. Difficulties in the alkylation of menthone derivatives (e.g., 4a --> 6a) were overcome by using Noyori's zincate enolate method. Related problems with nucleophilic addition to the hindered menthone core of 6a were resolved by using either organocerium or acetylide nucleophiles. Finally, two alternative olefin metathesis
描述了由(-)-异胡薄荷醇合成(+)-二氢-表-脱氧青蒿素B(3)。使用Noyori的锌酸酯烯醇盐方法可以克服薄荷酮衍生物的烷基化困难(例如4a-> 6a)。通过使用有机铈或乙炔亲核试剂解决了亲核加成到6a受阻薄荷酮核中的相关问题。最后,报道了两种可供选择的烯烃复分解方法用于最终环化。这项研究提供了对青蒿素倍半萜的反应性和合成加工的见解。