P(RNCH2CH2)3N: AN EFFICIENT PROMOTER FOR THE SYNTHESIS OF 3-SUBSTITUTED COUMARINS
摘要:
The title compounds wherein R = Me or i-Pr function as efficient promoters for the formation of coumarins in good to excellent yields (80-95%) from salicylaldehydes and di-activated methylene compounds of the type R'CH2CO2Et (R'= CO2Et, COMe, CN). Although the yields are not generally superior to those reported in the literature, our methodology is more convenient in that milder conditions and shorter reaction times are facilitated by the use of the aforementioned commercially available catalysts.
Carbostyril compounds, compositions containing same and processes for preparing same
申请人:OTSUKA PHARMACEUTICAL CO., LTD.
公开号:EP0187322A1
公开(公告)日:1986-07-16
A carbostyril compound of the formula (I):
wherein
R1 and R2 are as defined or its pharmaceutically acceptable salt, composition containing the compound and processes for preparing the same are disclosed.
The compound is useful as a cardiotonic agent.
METHOD FOR PRODUCING OPTICALLY ACTIVE CYANOHYDRIN COMPOUND
申请人:Sumitomo Chemical Company, Limited
公开号:EP2264005A1
公开(公告)日:2010-12-22
A method of producing an optically active cyanohydrin compound represented by formula (3)
(wherein, Q1 and Q2 are as defined below, and * represents that the indicated carbon atom is the optically active center) comprising reacting an aldehyde compound represented by formula (2)
(wherein, Q1 and Q2 represent each independently a hydrogen atom, optionally substituted alkyl group having 1 to 6 carbon atoms, or the like) with hydrogen cyanide in the presence of a silyl compound and an asymmetric complex which is obtained by reacting an optically active pyridine compound represented by formula (1)
(wherein, R1 and R2 represent each independently a hydrogen atom, alkyl group having 1 to 6 carbon atoms, or the like, provided that R1 and R2 are not the same.) with an aluminum halide.