Triethylamine → (1S,2RS,5S,6S,7R)-2-methanesulfonyloxy-3-methylene-6-[(E,3S)-3-t-butyldimethylsilyloxy-1-octenyl]-7-t-butyldimethylsilyloxybicyclo[3.3.0]octane

HRID 1974777Notes

Reaction equation

HRID 1974777 reaction equation
[OH:1][CH:2]1[C:9](=[CH2:10])[CH2:8][C@H:7]2[C@@H:3]1[CH2:4][C@@H:5]([O:27][Si:28]([C:31]([CH3:34])([CH3:33])[CH3:32])([CH3:30])[CH3:29])[C@H:6]2/[CH:11]=[CH:12]/[C@@H:13]([O:19][Si:20]([C:23]([CH3:26])([CH3:25])[CH3:24])([CH3:22])[CH3:21])[CH2:14][CH2:15][CH2:16][CH2:17][CH3:18].C(N(CC)CC)C.[CH3:42][S:43](Cl)(=[O:45])=[O:44]>C(Cl)Cl>[CH3:42][S:43]([O:1][CH:2]1[C:9](=[CH2:10])[CH2:8][C@H:7]2[C@@H:3]1[CH2:4][C@@H:5]([O:27][Si:28]([C:31]([CH3:33])([CH3:32])[CH3:34])([CH3:29])[CH3:30])[C@H:6]2/[CH:11]=[CH:12]/[C@@H:13]([O:19][Si:20]([C:23]([CH3:24])([CH3:25])[CH3:26])([CH3:21])[CH3:22])[CH2:14][CH2:15][CH2:16][CH2:17][CH3:18])(=[O:45])=[O:44]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 31297Methanesulfonyl chlorideHCID 13955240(1S,2RS,5S,6S,7R)-2-hydroxy-3-methylene-6-[(E,3S)-3-t-butyldimethylsilyloxy-1-octenyl]-7-t-butyldimethylsilyloxybicyclo[3.3.0]octane

Product 1

HCID 88442461(1S,2RS,5S,6S,7R)-2-methanesulfonyloxy-3-methylene-6-[(E,3S)-3-t-butyldimethylsilyloxy-1-octenyl]-7-t-butyldimethylsilyloxybicyclo[3.3.0]octaneYield 84%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
-25 °C

Procedure

The (1S,2RS,5S,6S,7R)-2-hydroxy-3-methylene-6-[(E,3S)-3-t-butyldimethylsilyloxy-l-octenyl]-7-t-butyldimethylsilyloxybicyclo[3.3.0]octane (127 mg, 0.25 mmole) obtained in Example 3 was dissolved in 1 ml of methylene chloride. The solution was cooled to -25° C., and triethylamine (38 mg, 0.375 mmole) and then a solution of methanesulfonyl chloride (43 mg, 0.375 mmole) in 1 ml of methylene chloride were added. The mixture was stirred for 2 hours. Ice water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The separated organic layer was washed with an aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate, and concentrated. The crude product was subjected to column chromatography (silica gel 15 g; hexane/ethyl acetate=30/1) to give (1S,2RS,5S,6S,7R)-2-methanesulfonyloxy-3-methylene-6-[(E,3S)-3-t-butyldimethylsilyloxy-1-octenyl]-7-t-butyldimethylsilyloxybicyclo[3.3.0]octane (123 mg, 0.21 mmole, 84%).

Workup

  1. extractionthe mixture was extracted with ethyl acetate
  2. washThe separated organic layer was washed with an aqueous solution of sodium chloride
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-9d3832b03ba44605b07ba59989c8c26d
Source dataset
uspto-grants-1994_02
Patent number
US05283349

Reaction notes

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