已经开发了Ru(II)催化的1,2,3,4-四氢喹啉的螯合辅助的高区域选择性C8-羟基化反应。各种1,2,3,4-四氢喹啉经过顺畅的C8–H羟基化反应,并以廉价且安全的K 2 S 2 O 8作为氧化剂和氧源,以高收率和高官能度耐受性提供了相应的产品。选择易于安装和拆卸的N-嘧啶导向基团是催化的关键。机理研究表明六元钌循环中间体参与了催化循环。该方法还可以扩展到其他(杂)芳烃CH键的直接羟基化反应。
2-benzyloxy-5-halo-acylanilide compounds and method of using them
申请人:Eastman Kodak Company
公开号:US06482985B1
公开(公告)日:2002-11-19
Disclosed is a compound comprising a 2-benzyloxy-5-haloacylanilide having the structural formula I:
wherein
R is hydrogen or an alkyl group,
RA is a substituent and n is 0-5; and
X is a halogen.
Also disclosed is a method for preparing a coupler using the compound. The compound and method simplify the preparation of photographic couplers.
The invention provides compounds of general formula (I) wherein A, X, m, R
1
, N, R
2
, Z
1
, Z
2
, Q, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
, t and R
16
are as defined in the specification, processes for their preparation, pharmaceutical compositions containing them and their use in therapy.
1