Friedelin (1) and 3-acetoxyfriedel-3-en-2-one (4), commonly known as friedelane triterpenoids, have been isolated fromcorksmokerwashsolids (also known as black wax) on a multi-gram scale. These compounds are valuable starting materials for the synthesis of new friedelane derivatives. Stereoselective reduction of friedelin by treatment with LiAlH4, sodium, or catalytic hydrogenation results in the
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