2006
DOI: 10.1002/anie.200504344
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A Highly Enantioselective Brønsted Acid Catalyst for the Strecker Reaction

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Cited by 208 publications
(94 citation statements)
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References 50 publications
(4 reference statements)
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“…Recently, hydrogen-bond donors such as ureas/thioureas, [10][11][12][13][14][15][16][17][18][19][20][21][22][23] BINOL/diols, [24][25][26][27][28][29][30][31][32] and phosphoric acids [33][34][35][36][37][38][39][40] have been also recognized as efficient organocatalysts. Novel urea and thiourea derivatives were developed as organocatalysts and their potential as a general acid has been successfully demonstrated by several groups.…”
Section: Introductionmentioning
confidence: 99%
“…Recently, hydrogen-bond donors such as ureas/thioureas, [10][11][12][13][14][15][16][17][18][19][20][21][22][23] BINOL/diols, [24][25][26][27][28][29][30][31][32] and phosphoric acids [33][34][35][36][37][38][39][40] have been also recognized as efficient organocatalysts. Novel urea and thiourea derivatives were developed as organocatalysts and their potential as a general acid has been successfully demonstrated by several groups.…”
Section: Introductionmentioning
confidence: 99%
“…Subsequent addition of HCN results in formation of the corresponding amino nitrile and the regenerated Brønsted acid catalyst. [11] Based on our previous results and observations, we herein report the application of yet another metalfree catalyst, the chiral TADDOL, for the hydrocyanation of aldimines. Furthermore, we describe the BINOL phosphate-catalyzed asymmetric Strecker reaction of ketoimines, which is generally not only more difficult to achieve as compared to the hydrocyanation of aldimines, [4h-j,5d] but additionally leads to the formation of valuable quaternary amino acids.…”
mentioning
confidence: 96%
“…[4] [6] Wir begannen unsere Studie mit der Suche nach dem passenden Brønsted-Säure-Katalysator [7] sowie der Untersuchung und Optimierung der Reaktionsparameter wie Katalysatormenge, Hydridquelle, Temperatur und Substratkonzentration. Die besten Ergebnisse hinsichtlich Reaktivität, Ausbeute und Selektivität wurden mit Brønsted-Säure-Katalysatoren des Typs 1, [5,8,9] in 2-Stellung substituierten Chinolinderivaten 2 und dem Hantzsch-Dihydropyridin 4 als Hydridquelle [5,6,10] erzielt. Nachfolgende Untersuchungen richteten sich auf die spezielle Katalysatorstruktur (Tabelle 1).…”
unclassified
“…Dies ist analog zu der kürzlich beschriebenen Binolphosphat-katalysierten Strecker-Reaktion. [9] Die höchsten Selektivitäten wurden mit Katalysator 1 f erzielt, der unter optimierten Bedingungen das 2-Phenyltetrahydrochinolin mit 97 % ee ergab (Tabelle 1, Nr. 6).…”
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