Synthesis of Erythrina and related alkaloids. XVI Diels-Alder approach : Total synthesis of dl-erysotrine, dl-erythraline, dl-erysotramidine, dl-8-oxoerythraline and their 3-epimers.
Synthesis of Erythrina and related alkaloids. XVI Diels-Alder approach : Total synthesis of dl-erysotrine, dl-erythraline, dl-erysotramidine, dl-8-oxoerythraline and their 3-epimers.
Total synthesis of erythrinan alkaloids was achieved by a strategy based on the Diels-Alder reaction of activated butadienes to a dioxopyrroline. The reaction of isoquinolinopyrrolinedione (15) with 1, 3-bis-O-substituted butadienes proceeded in a regiospecific and stereoselective manner to give erythrinan derivatives (20) and (21). Lithium borohydride reduction of the adduct (20) or (21), followed by acid hydrolysis afforded the enone (33). Mesylation of 33 and subsequent demethoxycarbonylation of 42 under neutral conditions gave the dienone (43). Meerwein-Ponndorf reduction of 43 and subsequent methylation afforded erysotramidine (2a) and 8-oxoerythraline (2b). Aluminum hydride reduction of the 8-oxo derivatives (2) furnished dl-erysotrine (1a) and dl-erythraline (1b).
Asymmetric Alkaloid Synthesis: A One-Pot Organocatalytic Reaction to Quinolizidine Derivatives
作者:Johan Franzén、Andreas Fisher
DOI:10.1002/anie.200805130
日期:2009.1.12
One pot+two steps=three stereocenters: A short enantioselective synthesis to access the indolo[2,3a]quinolizidine and the benzo[a]quinolizidine skeleton has been developed (see scheme; TMS=trimethylsilyl, R1=aromatic, R2=3‐indoyl or 3,4‐dimethoxyphenyl). The sequence involves an organocatalytic conjugate addition and subsequent acid‐catalyzed cyclization of the acyliminium ion.
一锅两步=三个立体中心:已开发出一种简短的对映体选择性合成方法,用于合成吲哚[2,3 a ]喹唑烷和苯并[ a ]喹唑烷骨架(参见方案; TMS =三甲基甲硅烷基,R 1 =芳香族,R 2 = 3-吲哚基或3,4-二甲氧基苯基)。该序列涉及有机催化共轭物的添加以及随后对酰基酰亚胺离子的酸催化环化。
Pyrrolo (2.1a)dihydroisoquinolines and their use as phosphodiesterase 10a inhibitors
申请人:——
公开号:US20040138249A1
公开(公告)日:2004-07-15
The present invention relates to pyrrolo[2.1-a]dihydroisoquinolines which are inhibitors of phosphodiesterase 10a and can be used for combating cancer.
本发明涉及吡咯并[2.1-a]二氢异喹啉,它们是磷酸二酯酶10a的抑制剂,可用于抗击癌症。
Diverse Asymmetric Quinolizidine Synthesis: A Stereodivergent One-Pot Approach
作者:Wei Zhang、Johan Franzén
DOI:10.1002/adsc.200900686
日期:2010.2.15
A diverse stereodivergent organocatalytic one-potaddition/cyclization/annulation sequence to optically active quinolizidine derivativesfrom easily available starting materials is presented. The one-pot sequence relies on a pyrrolidine-catalyzed enantioselective conjugate addition of electron-deficient amide α-carbons to α,β-unsaturated aldehydes, spontaneous hemiaminal formation and acid-catalyzed/mediated
The present invention relates to pyrrolo[2.1-a]isoquinolines which are inhibitors of phosphodiesterase 10a, a process for preparing these compounds and a method of treating cancer in humans and animals by administering these compounds.