Synthesis of 3-hexahelicenol and its transformation to 3-hexahelicenylamines, diphenylphosphine, methyl carboxylate, and dimethylthiocarbamate
2003
A nonphotochemical synthetic route to 3-hexahelicenol is reported. It involves a key [2+2+2] cycloisomerization of CH3O-substituted triyne that is readily available from 1-methoxy-3-methylbenzene and 1-bromo-2-(bromomethyl)naphthalene. Further functional group transformations led to 3-CO2CH3, 3-NH2, 3-PPh2, and 3-SC(O)N(CH3)2 substituted hexahelicenes.
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