Selective deprotection of allyl amines using palladium
摘要:
Mono and diallylamines can be cleaved using Pd(0) catalyst and 2-mercaptobenzoic acid as nucleophile. This methodology has been successfully used for the sequential deprotection of diallylamines. The yields of desallylation are good to quantitative.
Synthesis and Derivatization of Substituted (R)- and (S)-C-Allylglycines
作者:Nong Zhang、Winfried Münch、Udo Nubbemeyer
DOI:10.1002/adsc.200404102
日期:2004.9
substitution with complete inversion of the configuration. High diastereoselectivities were obtained (>15 : 1). The auxiliary could be efficiently removed by organolithium reactions of the amides furnishing α-amino ketones. Another allyllithium addition allowed us to introduce a second allyl chain with high diastereoselectivity. Final ringclosures by means of metatheses using Grubbs' (I) catalyst gave raise
各种([R )-和(小号) - c ^ -allylglycine衍生物通过辅助控制非对映选择性氮杂Claisen重排的方法合成。从衍生自旋光性脯氨酸的(S)-构型助剂开始,氮杂-克莱森重排使我们能够合成α(R)-构型的γ,δ-不饱和酰胺。由于(R)-烯丙基甘氨酸衍生物可以通过使N-烯丙基脯氨酸衍生物与各种受保护的甘氨酸氟化物反应而直接生成,因此相应的(S)-对映异构体通过最初的α-氯乙酰氯重排,随后的叠氮化物氯离子取代,构型完全反转。获得了高非对映选择性(> 15:1)。通过提供α-氨基酮的酰胺的有机锂反应可以有效地除去助剂。另一种烯丙基锂的加入使我们能够引入具有高非对映选择性的第二个烯丙基链。通过使用Grubbs(I)催化剂的复分解作用最终封闭环导致形成对映体纯的菲啶和环己烯,它们显示出确定的取代模式,可用于生物碱总合成。
Synthesis of Optically Active <b><i>C</i></b>-Allylglycine Derivatives and Conversion into Isoquinolones
作者:Udo Nubbemeyer、Nong Zhang
DOI:10.1055/s-2002-19804
日期:——
synthesized via an auxiliary controlled diastereoselective aza-Claisen rearrangement. The stereodirecting unit is placed on an auxiliary derived from commercially available (S)-proline. After N-allylation. the obtained optically active allylamines were reacted with various N-protected glycyl fluorides to give the (2R)-C-allylglycyl amides in good yields. The diastereoselectivity of the asymmetric allylation
[EN] METHYL 2-ALLYL-1 -METHYL-3-OXOINDOLINE-2-CARBOXYLATE AND 9A-ALLYL-1,2,3,9A-TETRAHYDRO-9H-PYRROLO[1,2-A]INDOL-9-ONE DERIVATIVES AND RELATED COMPOUNDS FOR USE AS FLUORESCENT MARKERS FOR LABELLING OF DRUGS, AMINO ACIDS AN PROTEINS<br/>[FR] DÉRIVÉS DE MÉTHYL 2-ALLYL-1 -MÉTHYL-3-OXOINDOLINE-2-CARBOXYLATE AND 9A-ALLYL-1,2,3,9A-TÉTRAHYDRO-9H-PYRROLO[1,2-A]INDOL-9-ONE ET COMPOSÉS ASSOCIÉS DESTINÉS À ÊTRE UTILISÉS COMME MARQUEURS FLUORESCENTS POUR LE MARQUAGE DE MÉDICAMENTS, D'ACIDES AMINÉS ET DE PROTÉINES
申请人:UNIV OF LANCASTER
公开号:WO2021116686A1
公开(公告)日:2021-06-17
Compounds of formulae (3) and (I) for use as fluorescent markers for labelling an amine containing target drug, an amino acid or a protein. (3) (I) Exemplary compounds are e.g. (II) (III) (IV).
3]-sigmatropic rearrangement of quaternary allylic ammonium ylides via in situ activation of tertiary allylicamines with arynes under mild conditions. Using 2-(trimethylsilyl)aryl triflates as aryne precursors, a range of tertiary allylicamines bearing electron-withdrawing groups underwent [2,3]-sigmatropic rearrangement to furnish structurally diverse homoallylic amines in moderate to good yields. The reaction
Catalyst‐ and Base‐Free Asymmetric Synthesis of Functionalized Prolines via One‐Pot Cascade Reactions
作者:Hyunkyung Cho、Jinju Kim、Jae Hyun Kim、Yeonghun Song、Sanghee Kim
DOI:10.1002/adsc.202000453
日期:2020.7.29
A one pot, three‐step cascade reaction to provide functionalized proline derivatives was developed. The Michael addition reaction of N‐allylated proline and activated alkyne forms a zwitterionic intermediate that further undergoes cyclization and [2,3]‐rearrangement to provide Cα‐alkylated proline bicyclic derivatives. This transformation was highly stereoselective and the chirality of the N‐allylated