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

HRID 1611447Notes

Reaction equation

[Cl:1][C:2]1[CH:7]=[C:6]([O:8][CH2:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[CH:5]=[C:4]([Cl:16])[C:3]=1[O:17][CH2:18][CH2:19][CH2:20][CH2:21]Cl.[CH3:23][C:24]1([CH3:34])[O:28][C:27]2[C:29]([OH:33])=[CH:30][CH:31]=[CH:32][C:26]=2[CH2:25]1>>[CH3:23][C:24]1([CH3:34])[O:28][C:27]2[C:29]([O:33][CH2:21][CH2:20][CH2:19][CH2:18][O:17][C:3]3[C:4]([Cl:16])=[CH:5][C:6]([O:8][CH2:9][C:10]4[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=4)=[CH:7][C:2]=3[Cl:1])=[CH:30][CH:31]=[CH:32][C:26]=2[CH2:25]1

Participants

Reactant 2

HCID 152782,3-Dihydro-2,2-dimethyl-7-benzofuranol

HCID 222571231,3-Dichloro-2-(4-chlorobutoxy)-5-(phenylmethoxy)benzene

Product 1

HCID 222571322-[4-(2,2-Dimethyl(2,3-dihydrobenzo[2,3-b]furan-7-yloxy))butoxy]-1,3-dichloro-5-(phenylmethoxy)benzene

Procedure

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.

Sources & evidence

ORD record: ord-623dde5974e3453080606027e17eb777
Source dataset: uspto-grants-2006_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06987194B2

Reaction notes

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