The tetracyclic system of 2,3,6,7,7a,8,12b,12c-octahydro-lH,5H-naphtho[1,2,3,i,j]quinolizine with trans/cis fusions of the B/D and B/C rings has been diastereospecifically synthesized in nine steps and in 23% total yield.
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Kouvarakis et al. (1995) studied this question.
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