A short and flexible route to tetrahydropyran-4-ones via conjugated nitrile oxidescycloaddition and oxa-Michael cyclization: a concise diastereoselective total synthesis of (±)-diospongin A
作者:Hongliang Yao、Jingyun Ren、Rongbiao Tong
DOI:10.1039/c2cc37772a
日期:——
flexible [3+2+1] synthetic strategy was developed for the synthesis of substituted tetrahydropyran-4-ones, featuring [3+2]-cycloaddition of alpha,beta-unsaturated nitrile oxides and alkenes and oxa-Michael cyclization in a 6-endo-trig fashion. The efficiency of this synthetic strategy was further demonstrated by the concise total synthesis of (+/-)-diospongin A in 8 steps with 20.2% yield.
开发了一种短而灵活的[3 + 2 + 1]合成策略,用于合成取代的四氢吡喃-4-酮,其特征在于,α,β-不饱和腈和烯烃的[3 + 2]-环加成反应和oxa-Michael环化反应6-endo-trig时尚。该合成策略的效率通过8个步骤的简明全合成(+/-)-双倍体皂苷A(20.2%的产率)得到了进一步证明。