2,3-Dihydro-2,2-dimethyl-7-benzofuranol → 2-[4-(2,2-Dimethyl(2,3-dihydrobenzo[2,3-b]furan-7-yloxy))butoxy]-1,3-dichloro-5-(phenylmethoxy)benzene

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Reaction Steps

In a first step as depicted in Scheme 1, an appropriately substituted phenol, for example, the known compound 2,6-dichloro-4-phenylmethoxyphenol, was reacted under basic conditions with a haloalkane derivative of a desired carbon chain length, for example 1-bromo-4-chlorobutane, to attach the bridging group B, thereby affording the corresponding 1,3-dichloro-2-(4-chlorobutoxy)-5-(phenylmethoxy)benzene (A). Intermediate (A) was then reacted under basic conditions with, for example, the known compound 2,2-dimethyl-2,3-dihydrobenzo[b]furan-7-ol, to attach moiety D, as well as the benzo-fused ring, affording the corresponding 2-[4-(2,2-dimethyl-(2,3-dihydrobenzo[2,3-b]furan-7-yloxy))butoxy]-1,3-dichloro-5-(phenylmethoxy)benzene (B). Intermediate (B), for example 2-[4-(2,2-dimethyl-(2,3-dihydrobenzo[2,3-b]furan-7-yloxy))butoxy]-1,3-dichloro-5-(phenylmethoxy)benzene, as set forth above, was then reduced with hydrogen gas in the presence of a catalyst, for example 10% palladium on carbon, providing the corresponding 4-[4-(2,2-dimethyl(2,3-dihydrobenzo[2,3-b]furan-7-yloxy))butoxy]-3,5-dichlorophenol (C). Intermediate (C) was then reacted under basic conditions with, for example, 1,1,1,3-tetrachloropropane, which simultaneously dehydrohalogenates, thereby introducing the moiety —E—G—C(R4)═C(R5)(R5) into the molecule to provide Compound 12, a novel compound of formula I. Example 1 set forth below, provides a detailed method to how Compound 12 shown in Scheme 1 was prepared.

Provenance & Evidence