Synthesis of spirocycles via ring closing metathesis of heterocycles carrying gem-diallyl substituents obtained via ring opening of (halomethyl)cyclopropanes with allyltributyltin
作者:Mukund K. Gurjar、Somu V. Ravindranadh、Kuppusamy Sankar、Sukhen Karmakar、Joseph Cherian、Mukund S. Chorghade
DOI:10.1039/b300314k
日期:2003.4.14
In the presence of allyl tri-n-butyltin--AIBN, cyclopropylmethyl bromides/xanthates undergo ring-opening reaction with concomitant formation of geminal diallyl derivatives in good yields. The ring closing metathesis reactions on geminal diallyl derivatives with Grubbs' catalyst provided spirocyclopentenyl products. Combination of these two methodologies has been applied to the synthesis of mono-,