material is described. The newly developed synthesis involves six-steps with 49% overall yield, and it introduces two ethyl groups at the 5- and 6-positions via sequential regioselective Friedel−Crafts acetylations and hydrogenations of N-protected-2-aminoindan. The Friedel−Crafts acetylations can be carried out neat with high regioselectivity using acetyl chloride as the reagent as well as the solvent,
描述了利用
2-氨基茚满作为便宜且可商购的起始原料有效和经济地合成5,6-
二乙基-2,3-二氢-1 H-
茚满-2-胺盐酸盐(1)。新开发的合成方法涉及六个步骤,总产率为49%,并且通过顺序的区域选择性Friedel-Crafts乙酰化反应和N保护的
2-氨基茚满的氢化反应,在5位和6位引入了两个乙基。Friedel-Crafts乙酰化反应可以使用
乙酰氯作为试剂以及溶剂,以高区域选择性的方式进行纯净,从而避免使用卤代溶剂。