Sequential Pd(0)-catalyzed reactions for the construction of multiple substituted furans. A short synthesis of the F5 furan fatty acid1a
摘要:
4,5-Dibromofurfural (1) undergoes a regioselective Pd(0)-catalyzed C-C bond forming reaction at its C-5 position to yield the corresponding furans 3. The second bromine substituent in C-4 position can be substituted by a methyl group in a subsequent Pd(0)-catalyzed cross coupling reaction. The furan fatty acid 12 and its benzyl ester 13 were prepared in a short synthetic sequence using this method. (C) 1998 Elsevier Science Ltd. All rights reserved.
The Preparation of 2,3,5-Tri- and 2,3-Disubstituted Furans by Regioselective Palladium(0)-Catalyzed Coupling Reactions: Application to the Syntheses of Rosefuran and the F5 Furan Fatty Acid
regioselective Pd0-catalyzed couplingreaction at the C-2 carbon atom. With alkynes the corresponding 2-alkynylfurans 4 and 5 were accessible (49–97% yield). Alkyl-, aryl-, and alkenylzinc reagents gave the 2-substituted furans 8 starting from compound 2 (66–84% yield). The 2-allylfurans 8e and 8f were obtained by a regioselective Stille coupling in 79% and 73% yield. The latter reaction was also applied to
Sequential Pd(0)-catalyzed reactions for the construction of multiple substituted furans. A short synthesis of the F5 furan fatty acid1a
作者:Thorsten Bach、Lars Krüger
DOI:10.1016/s0040-4039(98)00054-9
日期:1998.3
4,5-Dibromofurfural (1) undergoes a regioselective Pd(0)-catalyzed C-C bond forming reaction at its C-5 position to yield the corresponding furans 3. The second bromine substituent in C-4 position can be substituted by a methyl group in a subsequent Pd(0)-catalyzed cross coupling reaction. The furan fatty acid 12 and its benzyl ester 13 were prepared in a short synthetic sequence using this method. (C) 1998 Elsevier Science Ltd. All rights reserved.