反应详情

A solution of enone{(1S,5R,6R,7R)-6-[(1E,4R)-3-oxo-4-(m-tolyl)-1-pentenyl]-7-benzoyloxy-2-oxabicyclo[3.3.0]octan-3-one} (147.0 g) synthesized in Example 3 in THF (1480 mL) was cooled to −40° C., (−)-B-chlorodiisopinocampheylborane (1.7 M hexane solution) (721 mL) was added, and the mixture was stirred under ice-cooling for 20 hr. Acetone (183 mL) was added and the mixture was stirred for 3 hr. Aqueous sodium hydrogen carbonate was added, and the mixture was extracted with t-butyl methyl ether. The extract was dried over magnesium sulfate, and concentrated under reduced pressure to give a crude title compound (649.9 g).

1. temperaturecooling for 20 hr
2. stirringthe mixture was stirred for 3 hr
3. extractionthe mixture was extracted with t-butyl methyl ether
4. dry with materialThe extract was dried over magnesium sulfate
5. concentrationconcentrated under reduced pressure