Methyl iodide → HCID 101062134, compound

HRID 2120553Notes

Reaction equation

HRID 2120553 reaction equation
[CH3:1][C@H:2]1[C@:7]2([OH:30])[C@:8]34[O:28][C@H:27]5[C@@:16]6([C@@H:23]([OH:29])[C:24]([O:26]5)=[O:25])[C@H:17]([C:19]([CH3:22])([CH3:21])[CH3:20])[CH2:18][C@H:12]([C@@:13]36[C@@H:14]([OH:15])[C@@H:6]2[O:5][C:3]1=[O:4])[O:11][C:9]4=[O:10].[C:31]([O-])([O-])=O.[K+].[K+].IC>C(#N)C>[CH3:1][C@H:2]1[C@:7]2([OH:30])[C:8]34[O:28][CH:27]5[C@@:16]6([C@@H:23]([O:29][CH3:31])[C:24]([O:26]5)=[O:25])[C@H:17]([C:19]([CH3:22])([CH3:21])[CH3:20])[CH2:18][C@H:12]([C@:13]36[C@H:14]([OH:15])[CH:6]2[O:5][C:3]1=[O:4])[O:11][C:9]4=[O:10]

Participants

5

Reactant 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 6324617HCID 6324617, compound

Product 1

HCID 101062134HCID 101062134, compoundYield 56%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a suspension of ginkgolide B (0.030 g, 0.071 mmol) and K2CO3 (0.030 g, 0.212 mmol) in acetonitrile (0.5 mL) was added iodomethane (0.020 g, 0.141 mmol). The reaction mixture was heated under reflux for 30 min. This reaction resulted in a mixture of 10-methoxy-ginkgolide B and 1-methoxy ginkgolide B in a ratio of 4 to 1. 10-Methoxy-ginkgolide B was separated using an HPLC semi-preparative C18 column (7.8 mm×30 cmL) with a mobile phase of MeOH/H2O (40:60) at a flow of 2 mL/min to give the final product as a white solid (0.017 g, 56%). 1H NMR (400 MHz, CD3OD): δ1.14 (s, tert-butyl), 1.24 (d, J=7.1, CH3), 1.90 (dd, J=14.2, 4.6, 8-H), 2.06 (td, J=13.9, 4.3, 7α-H), 2.25 (dd, J=13.6, 4.6, 7β-H), 3.05 (q, J=7.1, 14-H), 3.80 (s, OCH3), 4.24 (d, J=7.4, 1-H), 4.57 (d, J=7.4, 2-H), 4.93 (s, 10-H), 5.43 (d, J=4.1, 6-H), 6.10 (s, 12-H). 13C NMR (75 MHz, CD3OD): δ7.6, 7.0, 29.6 (3 C), 32.9, 37.6, 41.8, 48.8, 68.6, 70.5, 71.5, 74.4, 80.4, 82.2, 84.8, 90.9, 98.2, 110.3, 171.1, 173.0, 175.4. [Hu, L., Chen, Z., Xie, Y., Jiang, Y., & Zhen, H. (2000) Bioorg. Med. Chem. 8, 1515-1521]

Workup

  1. temperatureThe reaction mixture was heated
  2. temperatureunder reflux for 30 min
  3. custom10-Methoxy-ginkgolide B was separated

Sources & evidence

ORD record
ord-10e88255cb8746a28e8f0cbd03abdc63
Source dataset
uspto-grants-2004_02
Patent number
US06693091B2

Reaction notes

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