Asymmetric synthesis of (2S,3S)- and (2S,3R)-3-prolinomethionines: 3-methylsulfanylmethyl-pyrrolidine-2-carboxylic acids
摘要:
The synthesis of 3-prolinomethionine can be easily achieved in a diastereoselective and enantioselective way via zinc-enolate cyclisation. After transmetallation by CuCN.2LiCl, the zinc-copper derivative was reacted with S-methyl methanesulfonothioate leading in a ''one-pot'' procedure, to N-(alpha-methylbenzyl)-3-prolinomethionine benzyl ester. The alpha-methylbenzyl group was transformed in vinyl-oxycarbonyl and tertiobutyloxycarbonyl groups successively. Reprotonation of cis Voc prolinomethionine enolate at low temperature yielded the enantiomerically pure trans diastereoisomer. (C) 1997 Elsevier Science Ltd.
Asymmetric synthesis of (2S,3S)- and (2S,3R)-3-prolinomethionines: 3-methylsulfanylmethyl-pyrrolidine-2-carboxylic acids
摘要:
The synthesis of 3-prolinomethionine can be easily achieved in a diastereoselective and enantioselective way via zinc-enolate cyclisation. After transmetallation by CuCN.2LiCl, the zinc-copper derivative was reacted with S-methyl methanesulfonothioate leading in a ''one-pot'' procedure, to N-(alpha-methylbenzyl)-3-prolinomethionine benzyl ester. The alpha-methylbenzyl group was transformed in vinyl-oxycarbonyl and tertiobutyloxycarbonyl groups successively. Reprotonation of cis Voc prolinomethionine enolate at low temperature yielded the enantiomerically pure trans diastereoisomer. (C) 1997 Elsevier Science Ltd.
Proline chimeras are useful tools for medicinal chemistry and/or biological applications. The asymmetric synthesis of cis-3-substituted prolines can be easily achieved via amino-zinc-ene-enolate cyclization followed by transmetalation of the cyclic zinc intermediate for further functionalization. Syntheses of prolino-homotryptophane derivatives were achieved through Negishi cross-coupling of the zinc
Compounds of the invention are useful in inhibiting thrombin and associated thrombotic occlusions having the following structure Formula (I): wherein u is CH or N; Q is 1)—N(R
25
)CH(R
30
)—wherein the nitrogen atom is attached to R
1
, and R
25
and R
30
are independently selected from the group consisting of hydrogen, C
3-6
cycloalkyl, and C
1-6
alkyl, or 2) wherein the nitrogen atom is attached to R
1
, and m is 0, 1, or 2.
1
The synthesis of 3-benzylprolines can be easily achieved in a diastereoselective and enantioselective way via amino-zincene-enolate cyclisation. Transmetalation of the cyclic zinc intermediate with Pd-2(dba)(3)/P(o-Tolyl)(3) allowed functionalisation with an aromatic ring. One-pot hydrogenolysis and Boc-protection led to the cis-isomer readily usable for peptide synthesis. The transisomer was obtained by epimerisation of the alpha-centre in a sealed tue Lit 200 degreesC. (C) 2004 Elsevier Ltd. All rights reserved.
US7144899B2
申请人:——
公开号:US7144899B2
公开(公告)日:2006-12-05
[EN] THROMBIN INHIBITORS<br/>[FR] INHIBITEURS DE THROMBINE
申请人:MERCK & CO INC
公开号:WO2002064559A2
公开(公告)日:2002-08-22
Compounds of the invention are useful in inhibiting thrombin and associated thrombotic occlusions having the following structure Formula (I): wherein u is CH or N; Q is 1)-N(R?25)CH(R30¿)- wherein the nitrogen atom is attached to R?1, and R25 and R30¿ are independently selected from the group consisting of hydrogen, C¿3-6?cycloalkyl, and C1-6alkyl, or 2) wherein the nitrogen atom is attached to R?1¿, and m is 0, 1, or 2.