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https://doi.org/10.1016/s0040-4039(00)78549-2
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Cite Journal: Tetrahedron Letters |  Publication Date: Dec 1, 1994 |
 Citations: 24 |
Affiliation: Roche (Switzerland)
Acetylenic ketones of type 4 and acetylenic acetals of type 6 ( Scheme 1) are excellent cyclization precursors for the acid-catalyzed synthesis of various heterocycles. Using this methodology, 5- and 2-substituted 3-bromothiophenes of types 7 and 8 have been prepared in good to excellent yields.
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