Makino K, Fukuda R, Sueki S, Anada M. Total Synthesis of Alanense A through an Intramolecular Friedel-Crafts Alkylation.
J Org Chem 2024;
89:2050-2054. [PMID:
38241043 DOI:
10.1021/acs.joc.3c02481]
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Abstract
The first total synthesis of cadinane sesquiterpenoid alanense A, in which an intramolecular dehydrative Friedel-Crafts alkylation of 2,5-diaryl-2-pentanol is incorporated as a key step, has been achieved. The combinatorial use of p-TsOH·H2O as a catalyst and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as a solvent provides 1,1-disubstituted tetrahydronaphthalene in 97% yield. It was also found that the combination of p-TsOH and HFIP is effective for the removal of phenolic MOM ether.
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