The first B(C6F5)3‐catalyzed deoxygenative reduction of amides into the corresponding amines with readily accessible and stable ammonia borane (AB) as a reducing agent under mild reaction conditions is reported. This metal‐free protocol provides facile access to a wide range of structurally diverse amine products in good to excellent yields, and various functional groups including those that are reduction‐sensitive
据报道,在温和的反应条件下,用易于获得且稳定的氨硼烷(AB)作为还原剂,将酰胺进行的首次B(C 6 F 5)3催化脱氧还原为相应的胺。该无金属方案可轻松获得各种结构多样的胺产品,且收率高至优异,并且对各种官能团(包括对还原敏感的官能团)均具有良好的耐受性。该新方法也适用于手性酰胺底物,而不会破坏对映体的纯度。BF 3 OEt 2助催化剂在该反应中的作用是通过酰胺-硼加合物的原位形成来活化酰胺羰基。
Novel pyrrolidine compound and a process for preparing the same
申请人:Moritani Yasunori
公开号:US20070167440A1
公开(公告)日:2007-07-19
The present invention relates to a novel pyrrolidine compound, which has a potent antagonistic activity against central cannabinoid (CB1) receptor, having the formula [I]: wherein each of R
1
and R
2
is (A) optionally substituted aryl (or heteroaryl) group, or (B) both of the groups combine to form a group of the formula: one of R
3
and R
4
is hydrogen and another is hydrogen, hydroxyl, hydroxyalkyl, etc., or both of R
3
and R
4
combine to form oxo group, R
5
is hydrogen or alkyl, Y is single bond, oxygen atom or a group of the formula: —N(R
7
)—, R
6
is optionally substituted hydrocarbon group or optionally substituted cyclic group, R
7
is alkyl or alkyloxycarbonylalkyl, provided that R
6
is not 4-amino-5-chloro-2-methoxyphenyl group when Y is single bond and one of the R
3
and R
4
is hydrogen and another is hydroxymethyl, or a pharmaceutically acceptable salt thereof.