The title compounds are obtained in moderate to high yields by BF3-assisted reaction of 1-benzothiophen-3(2H)-one with nine ketones in diethyl ether at room temperature; the relative amounts of pyran 1 and ylidene 2 prove to be dependent upon electronic and steric factors.
Boron Trifluoride-assisted Reactions of 1-Benzothiophen-3(2H)-one with Various Ketones: a Convenient Entry to 2-Methylene-1-benzothiophen-3(2H)-one and/or 6H-Di[1]benzothieno[3,2-b:2,3-e]pyran Derivatives / FRALEONI MORGERA, Alessandro; Zanirato, Paolo. - In: JOURNAL OF CHEMICAL RESEARCH. SYNOPSES. - ISSN 0308-2342. - ELETTRONICO. - (1999), pp. 542-543. [10.1039/A904789A]
Boron Trifluoride-assisted Reactions of 1-Benzothiophen-3(2H)-one with Various Ketones: a Convenient Entry to 2-Methylene-1-benzothiophen-3(2H)-one and/or 6H-Di[1]benzothieno[3,2-b:2,3-e]pyran Derivatives
FRALEONI MORGERA, Alessandro;
1999-01-01
Abstract
The title compounds are obtained in moderate to high yields by BF3-assisted reaction of 1-benzothiophen-3(2H)-one with nine ketones in diethyl ether at room temperature; the relative amounts of pyran 1 and ylidene 2 prove to be dependent upon electronic and steric factors.Pubblicazioni consigliate
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