Studies Aimed at the Total Synthesis of Azadirachtin. A Modeled Connection of C-8 and C-14 in Azadirachtin
摘要:
[GRAPHIC]Studies on the connection between the right and left segments of azadirachtin are described. The Ireland-Claisen rearrangement of Li-enolate of the modeled ester with dichlorodimethylsilane in toluene afforded the desired limonoid framework stereoselectively in good yield.
Absolute Configuration and Total Synthesis of a Novel Antimalarial Lipopeptide by the de Novo Preparation of Chiral Nonproteinogenic Amino Acids
作者:Shibaji K. Ghosh、Brinda Somanadhan、Kevin S.-W. Tan、Mark S. Butler、Martin J. Lear
DOI:10.1021/ol300293a
日期:2012.3.16
Marfey’s derivatization studies) and the total synthesis of a novel antimalarial lipid-peptide isolated from Streptomyces sp. (IC50 = 0.8 μM, Plasmodium falciparum 3D7) is disclosed. To this end, versatile stereocontrolled routes to nonproteinogenicaminoacids (via catalytic Mannich, Sharpless methods) and enantiomeric trans fatty acids (via Evans alkylation, Kocienski–Julia olefination) have been
Asymmetric Total Synthesis of Eupalinilide E, a Promoter of Human HSPC Expansion
作者:Ramkrishna Maity、Saumen Hajra
DOI:10.1021/acs.orglett.2c01684
日期:2022.7.8
concise and scalable asymmetric total synthesis of eupalinilde E from (R)-(−)-carvone in 12 steps is reported with an overall yield of 20%. The key steps of the synthesis are a tandem Favorskii rearrangement–elimination reaction in the chromatography-free synthesis of carvone-derived 2-cyclopentene carbaldehyde and its catalyst-free stereospecific tandem allylboration–lactonization using recyclable trifluoroethanol
据报道,通过 12 个步骤从 ( R )-(-)-香芹酮合成 eupalinilde E 的简明且可扩展的不对称全合成,总产率为 20%。合成的关键步骤是在香芹酮衍生的 2-环戊烯甲醛的无色谱合成中的串联 Favorskii 重排-消除反应,及其使用可回收三氟乙醇作为促进剂和溶剂的无催化剂立体定向串联烯丙基硼化-内酯化反应,得到 β-羟甲基-α-亚甲基-γ-丁内酯。
[EN] CEREBLON LIGANDS<br/>[FR] LIGANDS DE CÉRÉBLON
申请人:UNIV MICHIGAN REGENTS
公开号:WO2022187423A1
公开(公告)日:2022-09-09
The present disclosure provides compounds of Formula (I), wherein A, A1, A2, A3, R3, Z and Z1are as defined in the specification, and the salts and solvates thereof. The present disclosure also relates to uses of the compounds as cereblon (CRBN) ubiquitination inhibitors, as synthetic intermediates that can be used to prepare PROTAC molecules, or as PROTAC molecules. The present disclosure also relates to uses of the compounds, e.g., in treating or preventing cancer and other diseases.
Synthesis of enantiopure 2-C-methyl-d-erythritol-4-phosphate
作者:Sadagopan Raghavan、T. Sreekanth
DOI:10.1016/j.tetlet.2007.10.129
日期:2007.12
The synthesis of enantiopure 2-C-methyl-D-erythritol-4-phosphate is disclosed. A 1,3-diol possessing a quaternary stereogenic centre, prepared stereo selectively from an acyclic tri-substituted alkene, has been utilized as a key intermediate. (C) 2007 Elsevier Ltd. All rights reserved.