A Palladium-Catalyzed Multicomponent Synthesis of Imidazolinium Salts and Imidazolines from Imines, Acid Chlorides, and Carbon Monoxide
作者:Kraig Worrall、Boran Xu、Sébastien Bontemps、Bruce A. Arndtsen
DOI:10.1021/jo101858d
日期:2011.1.7
imidazolinium carboxylates and imidazolines is described. The palladium catalyst [Pd(CH(R1)N(R2)COR3)Cl]2, or [Pd(allyl)Cl]2, with P(t-Bu)2(2-biphenyl) can mediate the simultaneous coupling of two imines, acid chloride, and carbon monoxide into substituted imidazolinium carboxylates within hours under mild conditions (45 °C, 4 atm of CO). The reaction proceeds in good yield with aryl-, heteroaryl-, and alkyl-substituted
Highly enantioselective and diastereoselective synthesis of β-amino acid esters and β-lactams from achiral esters and imines
作者:E.J. Corey、Carl P. Decicco、Ronald C. Newbold
DOI:10.1016/s0040-4039(00)92366-9
日期:1991.9
The reaction of S-tert-butyl thiopropionate with a number of N-benzyl or N-allyl aldimines (4) as promoted by the chiral diazaborolidine 1 and triethylamine afforded the β-amino acidesters 5 with high diastereoselectivity and enantioselectivity, providing a simple route to chiral β-lactams 6.
Pd-catalyzed asymmetric allylic alkylations via C–H activation of N-allyl imines with glycinates
作者:Barry M. Trost、Xiaoxun Li
DOI:10.1039/c7sc02899g
日期:——
Herein is reported the first example of palladium-catalyzedasymmetricallylic alkylation (AAA) reactions involving 2-aza-π-allyl palladium intermediates. The 2-aza-π-allyl complex was generated via a novel mode of activation of N-allyl imines. Pd-catalyzed C(sp3)–H activation of N-allyl imines and subsequent nucleophilic attack by glycinates delivered vicinal diamino derivatives as the sole regioisomers
Sequential Metal-Free Thermal 1,3-Dipolar Cycloaddition of Unactivated Azomethine Ylides
作者:Verónica Selva、Elisabet Selva、Pedro Merino、Carmen Nájera、José M. Sansano
DOI:10.1021/acs.orglett.8b01292
日期:2018.6.15
The thermal 1,3-dipolarcycloaddition of unactivated azomethine ylides derived from allylamine and aromatic or heteroaromatic aldehydes with maleimides and 1,1- and 1,2-bis(phenylsulfonyl)ethylene affords endo-2,5-trans cycloadducts in moderate to good yields. DFT calculations provide evidence that the diastereoselectivity observed depends on the isomerization between S- and W-ylides according to Curtin-Hammett’s