作者:Gul Hassan Walizei、Eberhard Breitmaier
DOI:10.1055/s-1989-27249
日期:——
Pyrroles from 3-Alkoxyacroleins and CH-acidic α-Aminoacetic Acid Derivatives 2-Alkoxycarbonylpyrroles and 2-cyanopyrroles 4 are prepared in a one-step synthesis by vinylogous amidation of 3-alkoxyacroleins 1 with glycine ester 2a-c and aminoacetonitrile (2d), followed by basecatalyzed cyclodehydration of the intermediate 3-aminoacroleins 3. The 3-hydroxypropyl function can be introduced into the pyrrole ring by using 3,4-dihyrdo-2H-pyran-5-carbaldehyde (5) as a cyclic 3-alkoxyacrolein.
由 3-烷氧基丙烯醛和 CH-酸性δ±-氨基乙酸衍生物制备吡咯 2-烷氧基羰基吡咯和 2-氰基吡咯 4 的一步合成法是先用甘氨酸酯 2a-c 和氨基乙腈 (2d) 对 3-烷氧基丙烯醛 1 进行乙烯基酰胺化反应,然后在碱催化下对中间体 3-氨基丙烯醛 3 进行环脱水反应。使用 3,4-二氢-2H-吡喃-5-甲醛 (5) 作为环状 3-烷氧基丙烯醛,可将 3-羟丙基功能引入吡咯环。