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Volumn 33, Issue 41, 1992, Pages 6127-6130

A simple and general method for the asymmetric synthesis of α-aminophosphonic acids

Author keywords

[No Author keywords available]

Indexed keywords

PHOSPHONIC ACID DERIVATIVE; PHOSPHONOAMINO ACID;

EID: 0026663281     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(00)60023-0     Document Type: Article
Times cited : (41)

References (24)
  • 8
    • 84985186249 scopus 로고
    • Asymmetric synthesis of α-aminophosphonic acids, I enantioselective synthesis of L-(1-aminoethyl)phosphonic acid by asymmetric catalytic hydrogenation ofN-[1-(dimethoxyphosphoryl)ethenyl]formamide
    • (1985) Liebigs Annalen der Chemie , pp. 555
    • Schöllkopf1    Hoppe2    Thiele3
  • 11
    • 84985225807 scopus 로고
    • Asymmetrische Synthese von α-Aminophosphonsäuren, III. Asymmetrische Synthese von (S)-(1-Aminoalkyl)phosphonsäure-diethylestern unter Verwendung von (+)-Campher als chiralem Hilfsreagens
    • (1987) Liebigs Annalen der Chemie , pp. 45
    • Schöllkopf1    Schütze2
  • 15
    • 84986691327 scopus 로고
    • Phosphoranaloge von Aminosäuren III1. Synthese optisch aktiver 1-Aminoalkylphosphonsäuren der (S)- und (R)-Reihe mit Hilfe von (-)-Ephedrin als Auxiliar
    • (1990) Synthesis , pp. 132
    • Sting1    Steglich2
  • 20
    • 84919197346 scopus 로고    scopus 로고
    • 4) and evaporated under vacuum to give a white crystalline compound which was recrystallized from ether ( 17.6 g; 65% yield).
  • 21
    • 84919197345 scopus 로고    scopus 로고
    • Attempts to deprotonate phosphonate 4 using LDA (1–4 eq.), KHMDS or NAHMDS (2 eq.), n-BuLi (1–3 eq.) or 1 eq. t-BuLi proved unsuccessful.
  • 22
    • 84919197344 scopus 로고    scopus 로고
    • In a typical experiment t-BuLi (1.5 M in pentane, 1.6 mmol) was added to a solution of phosphonate 4 (0.75 mmol) in dry THF (10 mL) cooled at −78°C. After 20 min alkyl halide (8 mmol) was added to the yellow solution. The reaction was quenched with water after disappearance of starting material (ca 30 min) and then allowed to warm to room temperature. Flash-chromatography of the crude mixture afforded the α-alkylated compound (yield 60–85% see Table).
  • 24
    • 84919197343 scopus 로고    scopus 로고
    • 2n.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.