A facile preparation of 2- and 5-substituted 3-bromothiophenes
作者:T. Masquelin、D. Obrecht
DOI:10.1016/s0040-4039(00)78549-2
日期:1994.12
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.