Asymmetric Reduction of Prochiral Cyclic Imines to Alkaloid Derivatives by Novel Asymmetric Reducing Reagent in THF or under Solid-State Conditions
摘要:
Asymmetric reductions of prochiral cyclic imines were studied using chiral nonracemic sodium acyloxy borohydride 2. The chiral nonracemic reducing agent 2 has been easily prepared by the reaction of NaBH(4) with N,N-phthaloyl amino acid 1 in THF. The reagent reduces the prochiral cyclic imines 3 and 5 to the alkaloid derivatives 4 and 6 in good enantioselectivity (65-75% ee). The reduction of prochiral cyclic imines with the reagent in the presence of ZnCl(2) or under solid-state conditions showed higher enantioselectivity (83-100% ee).
[EN] POLYCYCLIC COMPOUNDS AS POTENT ALPHA2-ADRENOCEPTOR ANTAGONISTS<br/>[FR] COMPOSES POLYCYCLIQUES COMME ANTAGONISTES PUISSANTS DES RECEPTEURS DOLLAR G(A)2-ADRENERGIQUES
申请人:ORION CORP
公开号:WO2003082866A1
公开(公告)日:2003-10-09
The invention provides a compound of formula I, wherein X, Z, R1 to R10, R15, R16, m, n, r and t are as defined in claim 1, or a pharmaceutically acceptable salt or ester thereof, useful as an alpha-2 antagonist. The compounds of formula I can be used for the treatment of diseases or conditions where antagonists of alpha-2 adrenoceptors are indicated to be effective.
Polycyclic compounds as potent alpha2-adrenoceptor antagonists
申请人:Din Belle David
公开号:US20060094740A1
公开(公告)日:2006-05-04
A compound of formula 1,
wherein X, Z, R
1
to R
10
, R
15
, R
16
, m, n, r and t are as defined in claim 1, or a pharmaceutically acceptable salt or ester thereof, useful as an alpha-2 antagonist. The compounds of formula I can be used for the treatment of diseases or conditions where antagonists of alpha-2 adrenoceptors are indicated to be effective.