The aspidosperma alkaloid precursor (-)-(4aR,8aS,8R)-4a-ethyl-decahydroquinolin-7-one 7 (hydrolilolidone) was prepared from (+)-(1'S,4aR,8aS)-4a-ethyl-1-(1'-phenylethyl)octahydroquinolin-7-one 3. In addition, a synthesis of (+)-aspidospermidine 9 using compound 7 as starting material is described.
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Gnecco et al. (2003) studied this question.