Short asymmetric synthesis of (2S,3S)- and (2S,3R)-3-prolinoglutamic acids: 2-carboxy-3-pyrrolidine-acetic acids (CPAA)
摘要:
The asymmetric synthesis of both cis and trans 3-prolinoglutamic acids can be easily achieved in a diastereoselective and enantioselective way via the amino zinc-enolate cyclisation. (C) 2002 Elsevier Science Ltd. All rights reserved.
Synthesis, receptor binding and activity of iso and azakainoids
作者:Wentian Wang、Dragan D. Simovic、Mingping Di、Lynne Fieber、Kathleen S. Rein
DOI:10.1016/j.bmcl.2013.02.046
日期:2013.4
production of an unsubstituted azakainoid are described. The 1,3-dipolarcycloaddition of diazomethane with trans-dibenzyl glutaconate yields a 1-pyrazoline, which may be reduced directly to the pyrazolidine. An unexpected trans-cis isomerization is observed during Hg/Al reduction of the 1-pyrazoline NN bond. Alternatively, when TMS diazomethane is used as the dipole, the resulting 2-pyrazoline obtained
描述了用于生产未取代的氮杂卡因素的两种合成方法。重氮甲烷与反式戊二酸二苄酯的 1,3-偶极环加成生成 1-吡唑啉,其可直接还原为吡唑烷。在 1-吡唑啉 N N 键的Hg/Al 还原过程中观察到意外的反式-顺式异构化。或者,当 TMS 重氮甲烷用作偶极子时,脱甲硅烷化后得到的 2-吡唑啉可以用 NaCNBH 3还原以提供反式氮藻酸盐类似物。还描述了通过迈克尔加成合成未取代的异类卡因素。谷氨酸受体结合分析表明氮杂卡尼碘对未指明的谷氨酸受体具有中等亲和力。应用氮芥类化合物后海兔神经元的膜去极化表明它是一种离子型谷氨酸受体激动剂。
First chemoenzymatic synthesis of (+)-2-carboxypyrrolidine-3-acetic acid, the nucleus of kainoid amino acids
The distinctive nucleus of kainoidaminoacids, (2S,3R)‐(+)‐2‐carboxypyrrolidine‐3‐acetic acid 6, was synthesized by a chemoenzymatic process, exploiting the diastereomeric cis/trans methyl pyroglutamate derivatives 10a, 10b, 10c/11a, 11b, 11c as key intermediates. These mixtures, when subjected to a kinetic resolution mediated by α‐chymotrypsin, reacted diastereo‐, regio‐, and enantioselectively to
Stereoselective synthesis of non-proteinogenic amino acids via Michael addition to 3,4-didehydropyroglutamate derivative in which the carboxyl function is protected as a 2,7,8-trioxabicyclo[3.2.1]octane (ABO ester) group is described. The obtained 3-substituted pyroglutamic ABO ester was directly converted to 3-substituted glutamic acids such as chlorpheg by acidic hydrolysis, whereas 3-substituted
Short asymmetric synthesis of (2S,3S)- and (2S,3R)-3-prolinoglutamic acids: 2-carboxy-3-pyrrolidine-acetic acids (CPAA)
作者:Philippe Karoyan、Gérard Chassaing
DOI:10.1016/s0040-4039(01)02129-3
日期:2002.1
The asymmetric synthesis of both cis and trans 3-prolinoglutamic acids can be easily achieved in a diastereoselective and enantioselective way via the amino zinc-enolate cyclisation. (C) 2002 Elsevier Science Ltd. All rights reserved.
Diastereoselective synthesis of (2S,3R) 2-carboxy-3-pyrrolidine acetic acid, a simple kainic acid analogue
作者:Nicole Lunglois、Ratremaniaina Z. Andriamialisoa
DOI:10.1016/0040-4039(91)80687-2
日期:1991.6
(25,3R) 2-carboxy-3-pyrrolidine acetic acid was synthetized from (S)-pyroglutamic acid by a route involving the conjugate addition of t-butyl-2- lithiophenylthioacetate to N-methoxycarbonyl α, β-unsaturated lactam.