Synthesis of the bisbenzannelated spiroketal core of the γ‐rubromycins. The use of a novel Nef‐type reaction mediated by Pearlman’s catalyst
作者:Tanya Capecchi、Charles B. de Koning、Joseph P. Michael
DOI:10.1039/b002984j
日期:——
The synthesis of the bisbenzannelated spiroketal core 6 of γ-rubromycin 1 from the substituted nitrostyrene 20 was achieved by using a novel Nef-type reaction mediated by Pearlmanâs catalyst. The precursor 28 was synthesised from readily prepared starting materials using Henry condensation chemistry. The product 6 was found to exist in two conformations in solution as shown by NMR spectroscopy.
从取代的亚硝基苯乙烯20合成了伽玛-鲁博霉素1的双苯环化螺内酯结构核心6,采用了一种新型的Nef反应,且使用了Pearlman催化剂。前体28是通过亨利缩合反应从易得的起始材料合成的。NMR光谱显示,产物6在溶液中存在两种构象。