An expedient synthesis of N-unsubstituted 1,2,3-triazole-4-carboxylates has been demonstrated through [3 + 2] cycloaddition of sodium azide with α-haloacrylates. The process is highly reliable and exhibits an unusually wide scope with respect to α-fluoro-, α-chloro-, α-bromo-, and α-iodoacrylates. The potential of selected 1,2,3-triazole-4-carboxylates in the preparation of 1,5-dihydro-4H-[1,2,3]-triazolo-[4,5-c]-quinolin-4-one has also been illustrated.
通过
叠氮化
钠与δ-卤代
丙烯酸酯的[3 + 2]环加成,证明了一种 N-未取代的 1,2,3-三
唑-4-羧酸盐的便捷合成方法。该工艺非常可靠,而且适用于δ-
氟、δ-
氯、δ-
溴和δ-
碘丙烯酸酯的范围异常广泛。此外,还说明了选定的 1,2,3-三
唑-4-羧酸盐在制备 1,5-二氢-4H-[1,2,3]-三唑-[4,5-c]-
喹啉-4-酮方面的潜力。