METHOD FOR PREPARING A COUMARIN COMPOUND, CHROMENE COMPOUND, AND METHOD FOR PREPARING A CHROMENE COMPOUND
申请人:Wang Eng-Chi
公开号:US20120088923A1
公开(公告)日:2012-04-12
Disclosed herein is a method for preparing a coumarin compound of formula (F), in which R
1
, R
2
, and R
3
are independently H, C
1
˜C
7
alkoxy, C
1
˜C
7
alkyl, phenoxy, benzyloxy, or a halogen atom; R
4
is an alkyl group; and Ar is an optionally substituted aryl group,
the method including: treating a chromene compound having the following formula (E)
with an acid in the presence of water.
A chromene compound of formula (E) and a method for preparing the chromene compound of formula (E) are also disclosed.
Synthesis of 3-Alkoxymethylcoumarin from 3-Cyanochromene via a Novel Intermediate 2-Phenylimino-3-alkoxymethylchromene
作者:Jui-Chi Tsai、Sie-Rong Li、Michael Y. Chiang、Lian-Yeu Chen、Po-Yuan Chen、Yi-Fang Lo、Chen-Hao Wang、Chun-Nan Lin、Eng-Chi Wang
DOI:10.1021/jo9015634
日期:2009.11.20
method for the synthesis of 3-alkoxymethylcoumarin is described. From the reaction of 3-cyanochromene with an alkoxide and arylamine in THF, (Z)-2-phenylimino-3-alkoxymethylchromene was obtained as a novelintermediate via an isomerization of the double bond, a 1,2-addition of alkoxide, a Michael-type addition of aniline, an another isomerization of double bond and an elimination of ammonia. Subsequently