3,4-dihydro-2H-pyran → (1S,5R,6R,7R)-6-[(E)-3(RS)-t-butyl-dimethylsilyloxy-1-octenyl]-7-tetrahydropyranyloxy-2-oxabicyclo[3.3.0]octan-3-one

HRID 486166Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 486166
[Si:1]([O:8][CH:9]([CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])/[CH:10]=[CH:11]/[C@H:12]1[C@H:19]([OH:20])[CH2:18][C@H:17]2[C@@H:13]1[CH2:14][C:15](=[O:21])[O:16]2)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[O:27]1[CH:32]=[CH:31][CH2:30][CH2:29][CH2:28]1.C1(C)C=CC(S([O-])(=O)=O)=CC=1.[NH+]1C=CC=CC=1>C(Cl)Cl>[Si:1]([O:8][CH:9]([CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])/[CH:10]=[CH:11]/[C@H:12]1[C@H:19]([O:20][CH:28]2[CH2:29][CH2:30][CH2:31][CH2:32][O:27]2)[CH2:18][C@H:17]2[C@@H:13]1[CH2:14][C:15](=[O:21])[O:16]2)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

Komponenten

5

Edukt 3

HCID 80803,4-dihydro-2H-pyranHCID 466102Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1)HCID 15224603(1S,5R,6R,7R)-6-[(E)-3(RS)-t-butyldimethylsilyloxy-1-octenyl]-7-hydroxy-2-oxabicyclo[3.3.0]octan-3-one

Produkt 1

HCID 15224604(1S,5R,6R,7R)-6-[(E)-3(RS)-t-butyl-dimethylsilyloxy-1-octenyl]-7-tetrahydropyranyloxy-2-oxabicyclo[3.3.0]octan-3-one

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

To a solution of (1S,5R,6R,7R)-6-[(E)-3(RS)-t-butyldimethylsilyloxy-1-octenyl]-7-hydroxy-2-oxabicyclo-[3.3.0]octan-3-one (45) (4.69 g) in methylene chloride were added dihydropyran (5.17 g), and pyridinium p-toluenesufonate (0.77 g), and the resultant mixture was stirred at room temperature for 16 hours. The reaction mixture was treated in the conventional manner and the obtained crude product was subjected to the silica gel column chromatography to give the title compound (46) as a mixture of the diastereomers.

Aufarbeitung

  1. additionThe reaction mixture was treated in the conventional manner
  2. customthe obtained crude product

Quellen und Nachweise

ORD-Eintrag
ord-2da28dd4c0f3434e9e933eeefe613b73
Quelldatensatz
uspto-grants-1994_03
Patentnummer
US05290811

Notizen zur Reaktion

Wird geladen…