4-Methoxybenzenesulfonyl chloride → HCID 68579894, compound

HRID 641625Notes

Reaction equation

HRID 641625 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([S:9](Cl)(=[O:11])=[O:10])=[CH:5][CH:4]=1.C(N(CC)CC)C.[CH3:20][CH:21]1[C:30]2[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=2[C:24]2[S:31][CH:32]=[CH:33][C:23]=2[NH:22]1>CN(C)C1C=CN=CC=1.C(Cl)Cl>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([S:9]([N:22]2[C:23]3[CH:33]=[CH:32][S:31][C:24]=3[C:25]3[CH:26]=[CH:27][CH:28]=[CH:29][C:30]=3[CH:21]2[CH3:20])(=[O:11])=[O:10])=[CH:5][CH:4]=1

Participants

6

Reactant 3

HCID 74014-Methoxybenzenesulfonyl chlorideHCID 8471TriethylamineHCID 68578649HCID 68578649, compound

Product 1

HCID 68579894HCID 68579894, compoundYield 55.9%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent3×

Procedure

A solution of 4-Methoxybenzenesulfonyl chloride (16 g, 77 mmol), triethylamine (25 mL, 180 mmol), and 4-dimethylaminopyridine (0.20 g, 1.6 mmol) in methylene chloride (100 mL) was de-gassed with nitrogen and treated with a de-gassed methylene chloride (100 mL) solution of 5-Methyl4,5-dihydrothieno[3,2-c]isoquinoline (16 g obtained above) at 23° C. After 21 h the reaction mixture was quenched with 1 N aqueous sodium hydroxide (200 mL). The organic layer was separated and the aqueous phase was extracted with methylene chloride (2×200 mL). The combined extracts were washed with 1 N aqueous sodium hydroxide, 1 N aqueous hydrochloric acid, and brine (200 mL each), dried (K2CO3), and concentrated in vacuo to give the crude product (21 g) as a dark oil. The oil was taken up in methylene chloride (ca. 80 mL) and pre-adsorbed on silica gel (80 g). Flash chromatography on silica gel (400 g) eluting 25-, then 50-, and then 75% methylene chloride-hexane gave the product (16 g) as a yellow solid. Further elution with methylene chloride, then 10-, and then 20% ethyl acetate-methylene chloride gave recovered 5-methylthieno[3,2-c]isoquinoline (1.7 g, 14%) from the previous step. Recrystallization of the product from hot ethyl acetate-hexane provided the title compound (15 g, 79% overall based on recovered starting material from Step 1, m.p. 135-36° C.) as shiny yellow-orange prisms.

Workup

  1. customAfter 21 h the reaction mixture was quenched with 1 N aqueous sodium hydroxide (200 mL)
  2. customThe organic layer was separated
  3. extractionthe aqueous phase was extracted with methylene chloride (2×200 mL)
  4. washThe combined extracts were washed with 1 N aqueous sodium hydroxide, 1 N aqueous hydrochloric acid, and brine (200 mL each)
  5. dry with materialdried (K2CO3)
  6. concentrationconcentrated in vacuo
  7. customto give the crude product (21 g) as a dark oil
  8. washFlash chromatography on silica gel (400 g) eluting 25-

Sources & evidence

ORD record
ord-ca84da535bdd45f39e2ce0dbcf45ed1b
Source dataset
uspto-grants-2010_04
Patent number
US07696221B2

Reaction notes

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