作者:Naoshi Iwama、Masami Kashimoto、Hisashi Ohtaki、Taku Kato、Toshihiko Sugano
DOI:10.1016/j.tetlet.2004.10.077
日期:2004.12
The annulation method based on 2H-cyclohepta[b]furan-2-ones was applied for the synthesis of 2-alkylazulenes; 2-R-azulene (R = Et, i-Pr, n-Pr, i-Bu). Tropolone p-toluenesulfonate was used as a starting compound. By the two step synthesis, 1-carboxylic-3-cyanoazulene derivatives were obtained. Treatment of 1-carboxylic-3-cyanoazulene derivatives with aq H2SO4 resulted in decarboxylation and elimination
将基于2 H-环庚[ b ]呋喃-2-酮的环化方法用于2-烷基azulenes的合成。2-R-az(R = Et,i- Pr,n- Pr,i- Bu)。对甲苯磺酸对酮被用作起始化合物。通过两步合成,获得了1-羧基-3-氰基腈衍生物。用H 2 SO 4水溶液处理1-羧基-3-氰基az并氮烯衍生物导致脱羧并消除氰基基团,从而以高收率得到2-烷基az并烯。