Benzyl Alcohol → Benzyl 5-[(1-tert-butoxyformamido)methyl]-3,6-dimethoxy-9,9-dimethylxanthene-4-acetate

HRID 2395096Notes

Reaction equation

HRID 2395096 reaction equation
[C:1]([O:5][C:6]([NH:8][CH2:9][C:10]1[C:23]([O:24][CH3:25])=[CH:22][CH:21]=[C:20]2[C:11]=1[O:12][C:13]1[C:14]([CH2:30][C:31]([OH:33])=[O:32])=[C:15]([O:28][CH3:29])[CH:16]=[CH:17][C:18]=1[C:19]2([CH3:27])[CH3:26])=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH2:34](O)[C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1.C1(N=C=NC2CCCCC2)CCCCC1>C(Cl)Cl.CN(C)C1C=CN=CC=1>[C:1]([O:5][C:6]([NH:8][CH2:9][C:10]1[C:23]([O:24][CH3:25])=[CH:22][CH:21]=[C:20]2[C:11]=1[O:12][C:13]1[C:14]([CH2:30][C:31]([O:33][CH2:34][C:35]3[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=3)=[O:32])=[C:15]([O:28][CH3:29])[CH:16]=[CH:17][C:18]=1[C:19]2([CH3:26])[CH3:27])=[O:7])([CH3:2])([CH3:3])[CH3:4]

Participants

6

Reactant 3

HCID 244Benzyl AlcoholHCID 10868DicyclohexylcarbodiimideHCID 676449095-[(1-Tert-butoxyformamido)methyl]-3,6-dimethoxy-9,9-dimethylxanthene-4-acetic acid

Product 1

HCID 67645989Benzyl 5-[(1-tert-butoxyformamido)methyl]-3,6-dimethoxy-9,9-dimethylxanthene-4-acetateYield 80.8%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent2×

Procedure

A solution of 3 g (6.55 mmol) of 5-[(1-tert-butoxyformamido)methyl]-3,6-dimethoxy-9,9-dimethylxanthene-4-acetic acid in 65 ml of methylene chloride was cooled to 20° and treated with 1.1 ml (10.62 mmol) of benzyl alcohol. After the addition of 20 mg of 4-dimethylaminopyridine a solution of 1.5 g (7.27 mmol) of dicyclohexylcarbodiimide in 16 ml of methylene chloride was added dropwise, whereupon the mixture was warmed to room temperature and was stirred for 3 hours. The precipitated dicyclohexylurea was filtered off and washed with a small amount of methylene chloride. The filtrate was washed with sodium bicarbonate solution and water, dried over sodium sulphate and concentrated. The residue remaining was chromatographed on silica gel with hexane/ethyl acetate, whereby 2.9 g of benzyl 5-[(1-tert-butoxyformamido)methyl]-3,6-dimethoxy-9,9-dimethylxanthene-4-acetate were obtained as a colourless powder m.p. of 139°-141°; IR 3443, 2972, 2930, 1724, 1605, 1498 cm-1.

Workup

  1. additionwas added dropwise, whereupon the mixture
  2. filtrationThe precipitated dicyclohexylurea was filtered off
  3. washwashed with a small amount of methylene chloride
  4. washThe filtrate was washed with sodium bicarbonate solution and water
  5. dry with materialdried over sodium sulphate
  6. concentrationconcentrated
  7. customThe residue remaining was chromatographed on silica gel with hexane/ethyl acetate

Sources & evidence

ORD record
ord-987f02a0526041f28b973dda52729293
Source dataset
uspto-grants-1998_09
Patent number
US05811389

Reaction notes

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