作者:Walter Brade、Andrea Vasella
DOI:10.1002/hlca.19890720802
日期:1989.12.13
A new method for the synthesis of naphtho[2,3-b]pyrandiones from sulfonyllactones and 1-nitroglycals is presented. Thus, the sulfonyllactone 6 reacted with the 1-nitroglycal 7 in the presence of LDA at room temperature to give the naphthopyrandione 9 in high yields (Scheme 1). Reaction at a lower temperature led to the (intermediate) Michael-addition products 8. The sulfonyllactone 4 and the 1-nitroglycal
提出了一种由磺酰内酯和1-硝基糖合成萘并[2,3- b ]吡喃二酮的新方法。因此,sulfonyllactone 6与1 nitroglycal反应7在LDA存在下,在室温下,得到naphthopyrandione 9以高收率(方案1)。在较低温度下的反应导致(中间)迈克尔加成产物8。制备了磺酰内酯4和1-硝基糖醛5以用于合成萘并吡喃酮18(方案2)。碱促成的4和5得到17,将其脱保护得到18,其为真菌代谢产物(+)-隐孢菌素1的对映体。