天堂网亚洲,天天操天天搞,91视频高清,菠萝蜜视频在线观看入口,美女视频性感美女视频,95丝袜美女视频国产,超高清美女视频图片

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List ETHYL 5-ACETOXYINDOLE-2-CARBOXYLATE
31720-89-5

ETHYL 5-ACETOXYINDOLE-2-CARBOXYLATE synthesis

2synthesis methods
-

Yield:31720-89-5 100%

Reaction Conditions:

with dmap in acetic anhydride;ethyl acetate;

Steps:

A.ii ii

ii Ethyl 5-acetoxyindole-2-carboxylate A stirred solution of ethyl 5-hydroxyindole-2-carboxylate (7.79 g) and 4-dimethylaminopyridine (20 mg) in acetic anhydride (80 ml) was heated at 80° C. for 4 hours. The reaction was concentrated in vacuo and the residue was dissolved in ethyl acetate. Combined organic extracts were washed with hydrochloric acid (2 M), saturated aqueous sodium hydrogen carbonate solution, water, aqueous saturated sodium chloride solution and dried. The solution was concentrated in vacuo to yield the product as a yellow solid (9.39 g,100%). NMR(CD3SOCD3): δ 1.20 (t, 3H), 2.10 (s, 3H), 4.19 (q, 2H), 6.86 (dd, 1H), 6.97 (d, 1H), 7.20 (s, 1H), 7.29 (d, 1H); m/z 248 (MH+).

References:

US2003/144339,2003,A1