A practical and efficient synthesis of (±)- camptothecin
摘要:
A practical and efficient synthesis of (+/-)-camptothecin from glycine via an intramolecular Michael addition is described. (C) 1998 Elsevier Science Ltd. All rights reserved.
C−C Bond-Forming Reactions via Pd-Mediated Decarboxylative α-Imino Anion Generation
摘要:
alpha-Imino anions are generated under neutral reaction conditions via a Pd-mediated decarboxylation of allyl diphenylglycinate imines with concomitant formation of a pi-allylpalladium species. The resulting delocalized anion can attack the pi-allyl-Pd(II) species or be intercepted by aldehydes to afford homoallylic amines or protected 1,2-amino alcohols, respectively.
2 + 1] cycloaddition takes place in the rhodium-catalyzed reaction of 1,6-enynes with borylsilanes bearing an alkoxy group on the silicon atoms, which react as synthetic equivalents of silylene. The reaction proceeds efficiently in 1,2-dichloroethane at 80–110 °C in the presence of a rhodium catalyst bearing bis(diphenylphosphino)methane (DPPM) as a ligand to afford 1-silacyclopent-2-enes in good to
Ethyl N-(diphenylmethylene)glycinate as anionic glycine equivalent. Monoalkylation, dialkylation and Michael additions under solid-liquid phase-transfer catalysis
additions to ethylenic and acetylenic acceptors under appropriate solid-liquid phase transfer catalysis conditions. Further transformations of the α-disubstituted ketimines lead to α-alkylated aspartic and glutamic acid derivatives 10, 15, 19 and 26, to bicyclic amino acids or derivatives featuring pyrazolone and isoxazolone moieties 30 and 33, and to α-substituted (E)-3,4-dehydroglutamic acids.
Arginase Inhibitors and Their Therapeutic Applications
申请人:OncoArendi Therapeutics S.A.
公开号:US20170319536A1
公开(公告)日:2017-11-09
Disclosed are small molecule therapeutic compounds that are potent inhibitors of arginase 1 and arginase 2 activity. Also disclosed are pharmaceutical compositions comprising the compounds, and methods for using the compounds for treating or preventing a disease or condition associated with arginase activity.
Lewis acidic FeCl<sub>3</sub> promoted 2-aza-Cope rearrangement to afford α-substituted homoallylamines in dimethyl carbonate
作者:Karthik Gadde、Jonas Daelemans、Bert U. W. Maes、Kourosch Abbaspour Tehrani
DOI:10.1039/c9ra03277k
日期:——
The iron(III)-catalyzed efficient strategy for the synthesis of α-substituted homoallylamines was accomplished via a cationic 2-aza-Cope rearrangement of aldimines, generated in situ by condensation of commercially available aldehydes and easily synthesizable 1,1-diphenylhomoallylamines. This reaction features a broad substrate scope with high yields and is conducted in an eco-friendly solvent, i.e
铁 ( III ) 催化合成 α-取代的高烯丙胺的有效策略是通过醛亚胺的阳离子 2-aza-Cope 重排实现的,醛亚胺是由市售的醛和易于合成的 1,1-二苯基高烯丙胺缩合原位产生的。该反应具有广泛的底物范围和高收率,并且在环保溶剂即碳酸二甲酯中进行。
Synthesis of α-substituted and α,α-disubstituted α-amino acids by controlled mono- and dialkylation of ethyl N-diphenylmethyleneglycinate
Ethyl N-diphenylmethyleneglycinate reacts with one equivalent of alkylating agents in the presence of powdered potassium carbonate to afford, after hydrolysis, monoalkylated glycine esters. A similar process using two equivalents of alkylating agents in the presence of powdered potassium hydroxide and a phase transfer catalysts gives, after hydrolysis, dialkylated glycine esters.