4-Pyridinecarboxaldehyde → (Z)-4-[2-(3-Cyclopentyloxy-4-methoxyphenyl)ethenyl]pyridine

HRID 1781286

Reaktionsgleichung

Reaktionsgleichung von HRID 1781286
[O-]CC.[Na+].[N:5]1[CH:10]=[CH:9][C:8]([CH:11]=O)=[CH:7][CH:6]=1.[Cl-].[CH:14]1([O:19][C:20]2[CH:21]=[C:22]([C:28]3C=CC=CC=3[P+](C)(C3C=CC=CC=3)C3C=CC=CC=3)[CH:23]=[CH:24][C:25]=2[O:26][CH3:27])[CH2:18][CH2:17][CH2:16][CH2:15]1>C(O)C>[CH:14]1([O:19][C:20]2[CH:21]=[C:22](/[CH:28]=[CH:11]\[C:8]3[CH:7]=[CH:6][N:5]=[CH:10][CH:9]=3)[CH:23]=[CH:24][C:25]=2[O:26][CH3:27])[CH2:15][CH2:16][CH2:17][CH2:18]1

Komponenten

5

Edukt 3

HCID 133894-PyridinecarboxaldehydeHCID 2723922Sodium ethoxideHCID 86750869(3-Cyclopentyloxy-4-methoxyphenyl)-methyltriphenylphosphonium chloride

Produkt 1

HCID 67015247(Z)-4-[2-(3-Cyclopentyloxy-4-methoxyphenyl)ethenyl]pyridineAusbeute 11,9 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 702EthanolLösungsmittel2×

Versuchsvorschrift

A solution of sodium ethoxide [prepared from sodium (0.10 g, 4.50 mmol)] in ethanol (50 ml) was added over 5 min to a stirred mixture of 4-pyridine carboxaldehyde (0.44 g, 4.10 mmol) and (3-cyclopentyloxy-4-methoxyphenyl)-methyltriphenylphosphonium chloride (2.00 g, 4.08 g) in ethanol (30 ml). After 2 h, the reaction mixture was concentrated in vacuo and the residue partitioned between EtOAc (75 ml) and brine (50ml). The organic layer was separated, then dried (MgSO4) and concentrated in vacuo. A 1H n.m.r. spectrum indicated that the mixture consisted of a 3:2 mixture of (Z):(E) title compound (and triphenylphosphine oxide). A portion (0.6 g) of the mixture was subjected to chromatography (SiO2 ; hexane to EtOAc) to afford pure (Z)-title compound (0.14 g) as a pale yelow solid m.p. (Found: C, 77.18; H, 7.16; N, 4.63. C19H21NO2 requires C, 77.26; H, 7.17; N, 4.74%); δH (300 MHz; CDCl3) 1.5-1.55 (2H, br m, cyclopentyl H's), 1.65-1.9 (6H, br m, cyclopentyl H's), 3.83 (3H, s, OMe), 4.44 (1H, br m, OCHCH2), 6.40 (1H, d, J 12.2 Hz, CH=CH), 6.65-6.80 (4H, m, ArH ortho to OMe+2×ArH meta to OMe+CH=CH), 7.15 (2H, ca. d, J 6.0 Hz, pyridine H2, H6); m/z 295 (M+, 22%), 228 (15), 227 (100), 226 (94), 198 (35), 184 (15), 166 (12), 43 (19), and 41 (29).

Aufarbeitung

  1. concentrationthe reaction mixture was concentrated in vacuo
  2. customthe residue partitioned between EtOAc (75 ml) and brine (50ml)
  3. customThe organic layer was separated
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated in vacuo
  6. additionconsisted of a 3:2 mixture of (Z)

Quellen und Nachweise

ORD-Eintrag
ord-46541465def6464b8e0702bdac2c409a
Quelldatensatz
uspto-grants-1997_05
Patentnummer
US05633257

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