Реакция #50191

ord-ef9326ee0f3942f8a404fe41d999ff39

Уравнение реакции

CCCCCC(/C=C/[C@@H]1[C@H]2CC(=O)O[C@H]2C[C@H]1O)O[Si](C)(C)C(C)(C)C
(1S,5R,6R,7R)-6-[(E)-3(RS)-t-butyldimethylsilyloxy-1-octenyl]-7-hydroxy-2-oxabicyclo[3.3.0]octan-3-one
C1=COCCC1
dihydropyran
Cc1ccc(S(=O)(=O)[O-])cc1.c1cc[nH+]cc1
pyridinium p-toluenesufonate
→
CCCCCC(/C=C/[C@@H]1[C@H]2CC(=O)O[C@H]2C[C@H]1OC1CCCCO1)O[Si](C)(C)C(C)(C)C
title compound ( 46 )
CCCCCC(/C=C/[C@@H]1[C@H]2CC(=O)O[C@H]2C[C@H]1OC1CCCCO1)O[Si](C)(C)C(C)(C)C
(1S,5R,6R,7R)-6-[(E)-3(RS)-t-butyldimethylsilyloxy-1-octenyl]-7-tetrahydropyranyloxy-2-oxabicyclo[3.3.0]octan-3-one

Реактанты

—
resultant mixture
CCCCCC(/C=C/[C@@H]1[C@H]2CC(=O)O[C@H]2C[C@H]1O)O[Si](C)(C)C(C)(C)C
(1S,5R,6R,7R)-6-[(E)-3(RS)-t-butyldimethylsilyloxy-1-octenyl]-7-hydroxy-2-oxabicyclo[3.3.0]octan-3-one
C1=COCCC1
dihydropyran
Cc1ccc(S(=O)(=O)[O-])cc1.c1cc[nH+]cc1
pyridinium p-toluenesufonate

Реагенты

Нет

Растворители

ClCCl
methylene chloride

Условия реакции

Подробные условия
See reaction.notes.procedure_details.

Обработка

  1. 1
    workup.ADDITIONThe reaction mixture was treated in the conventional manner
  2. 2
    Другоеthe obtained crude product

Методика

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.

Источник

DOI: 10.6084/m9.figshare.5104873.v1Патент: US05426115uspto-grants-1995_06