Synthesis of the peptide moiety of the jamaicamides
摘要:
The jamaicamides, isolated from cyanobacterium Lyngbya majuscula in Jamaica, are unique mixed polyketide-peptides that are reported to be blockers of the sodium channels. The peptide moiety contains a pyrrolinone ring and a beta-methoxy enone functionality. Herein, we report the stereoselective synthesis of the N-(Boc)(2)-protected peptide moiety of the jamaicamides by utilizing Meldrum's acid starting from L-alanine and N-Boc-beta-alanine. (C) 2011 Elsevier Ltd. All rights reserved.
[EN] 6,7-DIHYDRO-4H-PYRAZOLO[1,5-A]PYRAZINE COMPOUNDS FOR THE TREATMENT OF INFECTIOUS DISEASES<br/>[FR] COMPOSÉS DE 6,7-DIHYDRO-4H-PYRAZOLO[1,5-A]PYRAZINE POUR LE TRAITEMENT DE MALADIES INFECTIEUSES
申请人:HOFFMANN LA ROCHE
公开号:WO2018011160A1
公开(公告)日:2018-01-18
The present invention relates to compounds of the formula (I) or pharmaceutically acceptable salts, enantiomer or diastereomer thereof, wherein R1 to R4 are as described above. The compounds may be useful for the treatment or prophylaxis of hepatitis B virus infection.
Suzuki-Miyaura Coupling Based Enantioselective Synthesis of (+)-epi- Clausenamide and the Enantiomer of Its 3-Deoxy Analogue
作者:Xiaoming Yu、Lu Zhang、Yumei Zhou
DOI:10.1055/s-0031-1290804
日期:2012.5
The first enantioselectivesynthesis of two biologically interesting close analogues of clausenamide, namely (+)-epi-clausenamide and (–)-3-deoxy-epi-clausenamide, was reported. Key steps of the synthesis included construction of the chiral pyrrolinone intermediates from d - and l -serine derivatives, introduction of the C4-phenyl by Suzuki–Miyaura coupling and establishment of the C6 configuration
报道了两种具有生物学意义的黄皮酰胺类似物的首次对映选择性合成,即 (+)-epi-clausenamide 和 (-)-3-deoxy-epi-clausenamide。合成的关键步骤包括从 d - 和 l - 丝氨酸衍生物构建手性吡咯啉酮中间体,通过 Suzuki-Miyaura 偶联引入 C4-苯基以及通过苏式选择性格氏反应建立 C6 构型。详细描述了关键 Suzuki-Miyaura 偶联反应的优化。
[EN] CARBOXY 6,7-DIHYDRO-4H-PYRAZOLO[1,5-A]PYRAZINE COMPOUNDS FOR THE TREATMENT OF INFECTIOUS DISEASES<br/>[FR] COMPOSÉS DE 6,7-DIHYDRO -4 H-PYRAZOLO [1,5-A] PYRAZINE POUR LE TRAITEMENT DES MALADIES INFECTIEUSES
申请人:HOFFMANN LA ROCHE
公开号:WO2018011162A1
公开(公告)日:2018-01-18
The present invention relates to compounds of the formula (I), or pharmaceutically acceptable salts, enantiomer or diastereomer thereof, wherein R1 to R3 are as described above. The compounds may be useful for the treatment or prophylaxis of hepatitis B virus infection.
Total synthesis of structures proposed for quinocitrinines A and B and their analogs. Microwave energy as efficient tool for generating heterocycles
作者:Victoria Machtey、Hugo E. Gottlieb、Gerardo Byk
DOI:10.3998/ark.5550190.0012.923
日期:——
A first totalsynthesis of the structuresproposed for quinocitrinines A and B has been accomplished by a three steps strategy which also applies for the synthesis of non-natural analogs. In the first step a microwave assisted Friedlander condensation between a substituted oamino-benzaldehyde and a substituted tetramic acid generated intermediate fused tricyclic quinolines which were N-methylated using
为奎尼奇宁 A 和 B 提出的结构的第一次全合成已通过三步策略完成,该策略也适用于非天然类似物的合成。在第一步中,取代的邻氨基苯甲醛和取代的特拉姆酸之间的微波辅助弗里德兰德缩合生成中间体稠合三环喹啉,其使用三氟甲磺酸甲酯进行 N-甲基化。天然化合物是在使用 BBr3 从芳环上裂解 O-甲基后获得的。所有反应都受到内酰胺环中 C-11 的差向异构化的影响,将奎尼替林 A 转化为奎尼奇宁 B。为了减少差向异构化,优化分析是必要的。
Total synthesis of epicoccamides A and D via olefin cross-metathesis
Epicoccamides A and D were synthesized through a route that utilizes fragment coupling via olefincross-metathesis as a key step. The right-hand segment of the epicoccamides was synthesized by a tandem O-acylation–migration reaction, and the left-hand segments were stereoselectively synthesized through a modified version of Crich’s β-selective mannosylation. The previously assigned absolute configuration