Assignment of carbon-13 nuclear magnetic resonance spectra of some friedelanes
作者:Amarendra Patra、Swapan Kumar Chaudhuri
DOI:10.1002/mrc.1260250202
日期:1987.2
diacetate and friedelane‐2β‐3β‐diyl diacetate have been made. The carbon signals of 3‐oxofriedelan‐29‐ol and its acetate, methyl 3‐oxofriedelan‐29‐oate, 3‐oxofriedelan‐30‐ol, maytenfoliol, maytensifolin‐A, maytensifolin‐B, pachysonol and pristimerin reported in the literature have also been considered for their specific resonanceassignments. A few signal assignments of somefriedelanes, viz. friedelan‐28‐ol
The isolation of friedelin, putranjivadione (I), friedelanol and a new trieterpenoid Roxburgholone, C30H50O2, from the bark of P. roxburghii has been described. Roxburgholone has been shown to be 3α-hydroxyfriedelan-7-one (II). The hydroxyketone obtained by sodium borohydride reduction of putranjivadione (1) has been shown to be 3β-hydroxyfriedelan-7-one (XIII).