1966
DOI: 10.1002/cber.19660990820
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Die Addukte primärer und sekundärer Amine an Carbonester der Acetylenreihe und ihre Konfiguration

Abstract: w Aus Propiolsaure-methylester und prim. Aminen entstehen cis-und rruns-3-Amino-acrylsauremethylester; im Gleichgewicht bevorzugt ist das cis-Isomere mit intramolekularer H-Brucke. Bei den Addukten der sek. Amine ist die trans-Konfiguration die thermodynamisch stabile. Auch aus den Amin-Additionen an Acetylendicarbonsaure-dimethylester gehen cis-truns-Gemische hervor; die stabilen Addukte primarer Amine gehoren der Amino-fumarsaureester-Reihe, die von sek. Aminen der Amino-maleinsaureester-Reihe an. Die Konfig… Show more

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Cited by 214 publications
(49 citation statements)
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References 29 publications
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“…Analogy for the proposed mechanism is found in the reactions of triazoline 15 with methacrylonitrile and with methyl methacrylate (2), reaction [ 5 ] , except that the precursor of 17 and 18 is a true zwitterion (16) and not just a polar structure such as 1.…”
Section: Nh2supporting
confidence: 52%
See 1 more Smart Citation
“…Analogy for the proposed mechanism is found in the reactions of triazoline 15 with methacrylonitrile and with methyl methacrylate (2), reaction [ 5 ] , except that the precursor of 17 and 18 is a true zwitterion (16) and not just a polar structure such as 1.…”
Section: Nh2supporting
confidence: 52%
“…An authentic sample of 21 prepared from methylpropiolate and tert-butyl amine (16) had Rf 0.21 (10% ethyl acetate in petroleum) and gave the published 'H nmr data (16). Crude 21, from thermolysis of 3 and concentrated by chromatography, gave the 'H nmr spectrum of authentic 21 except for extraneous signals from impurities in the former.…”
Section: Thermolysis Of 3 In Methanolmentioning
confidence: 99%
“…The signals of the methoxyl protons of methyl maleates are found slightly downfield from those of the fumarates (19)(20)(21). The methoxyl peaks in the 'H nmr spectrum of the minor isomer of 2g were found at 3.61 and 3.72 pprn while those of the major isomer appeared at 3.56 and 3.69 ppm.…”
Section: Resultsmentioning
confidence: 88%
“…times, are normally observed and are a consequence of the larger dipole moments of maleates compared with those of fumarates (23,5). The faster eluting isomer (3) had A, , , = 420 nm (log E = 4.13) in the uv spectrum compared to A, , , = 414 nm (log E = 3.55) for the isomer that was eluted more slowly (4).…”
Section: Mechanismsmentioning
confidence: 99%
“…[5]. Principal nitrogenous nucleophiles that react with 2 (or with analogues of 2) are amines (5)(6)(7)(8), pyridines (9, lo), and enamines (1 1-21). Typical reactions are illustrated with eqs.…”
Section: Introductionmentioning
confidence: 99%