Efficient stereoconservative synthesis of 1-substituted (S)- and
申请人:Astra Lakemedel Aktiebolag
公开号:US05300660A1
公开(公告)日:1994-04-05
Stereoconservative method for preparation of an (R)- or (S)-isomer of the compound of the formula I with at least 95% optical purity ##STR1## wherein R.sup.1 is a hydrogen atom, a saturated or unsaturated lower alkyl group, a cycloalkyl group, or a group (CH.sub.2).sub.m Ph wherein m is 0-3 and Ph is a substituted or unsubstituted phenyl group including 1) O,N-dialkylation, directly or stepwise of (R)- or (S)-proline 2) aminolysis 3) reduction to formation of the (R)- or (S)-isomer of the compound of the formula I, and new intermediates II and III in optical active form obtained by the reaction steps above and wherein R.sup.2 is defined as R.sup.1 above. ##STR2##
Intermediates for the stereoconservative synthesis of 1-substituted
申请人:Aktiebolaget Astra
公开号:US05468876A1
公开(公告)日:1995-11-21
Disclosed are (R)- and (S)-isomers of the compounds of the Formulas II and III with at least 95% optical purity ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and represent a hydrogen atom, a lower alkyl, lower alkenyl or lower alkynyl group, a cycloalkyl group or a group (CH.sub.2).sub.m Ph, wherein m is 0-3 and Ph is a substituted or unsubstituted phenyl group. These compounds are intermediates in the stereoconservative synthesis of 1-substituted (S)- and (R)-2-aminomethylpyrrolidines.
In vitro affinities of various halogenated benzamide derivatives as potential radioligands for non-invasive quantification of D2-like dopamine receptors
Benzamide derivatives as radiotracers have played an important role in diagnosing malfunction in dopaminergic neurotransmission. A variety of halogenated and two unsubstituted benzamide derivatives were synthesised and their in vitro affinities to dopaminergic, serotonergic and adrenergic receptors and their lipophilicities were determined. As references IBZM (3), raclopride (4) and FLB457 (5) were tested as well. The two iodinated compounds NAE (27) and NADE (28) displayed K-i values of 0.68 and 14 nM for the D-2 receptor. The well-established radiotracers FP (1) and DMFP (2) showed affinities in the same range as did the brominated compounds NABrE (29) and NABrDE (30). The logD(7.4) values of 2.91 for NAE (27) and of 2.81 for NADE (28) are in the range of those found for IBZM (3), FP (1) and DMFP (2). These facts allow to expect good properties for the two iodinated compounds NAE (27) and NADE (28) regarding in vivo imaging with SPECT. (C) 2007 Elsevier Ltd. All rights reserved.