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Rapid access to the tetracyclic core of TAN-1085 (1) was possible by exploiting three efficient processes: a tandem electrocyclic reaction (A), a pinacol cyclization (B), and a regioselective monobenzoylation of a 1,2-diol (C), which allowed the first total synthesis of 1.
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Ohmori et al. (2004) studied this question.
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