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Preparation
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See ref.
[12b]
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Typical Experiment:
Triton B (40% in MeOH, 340 µL, 1 equiv) was added
at 0 °C to a solution of (E)-2-nitro-but-2-ene 1a (1.3 equiv) and 2 (114 µL,
1.0 equiv) in anhyd THF (4 mL); the mixture was stirred at r.t.
for 6 h. After addition of diethyl ether (2 mL), the pink coloured
solution was filtered on a short pad of silica gel and the solvent
was removed under reduced pressure. The crude oil was recrystallized
in hexane to afford 3a: 56% yield;
mp 72 °C; IR: ν = 2951, 1738,
1545, 1259 cm-1. 1Η ΝΜR
(300 MHz, CDCl3): δ = 1.12 (d, J = 7.1, 3 H), 1.60 (s, 3 H),
3.00 (dt, J = 16.6, 3, 1 H),
3.17 (d, 16.6, 1 H), 3.71 (s, 3 H), 3.76 (s, 3 H), 3.79 (q, J = 7.3, 1 H), 5.26 (m, 2 H). 13C
NMR (100 MHz, CDCl3): δ = 11.6, 21.3,
40.4, 48.6, 52.6, 53.1, 60.9, 96.3, 112.3, 148.3, 170.7, 170.8.
MS (FAB+): m/z (%) = 272(5) [M + 1],
225(53), 165(100), 137(41).
Crystal data: C12H17NO6,
M = 271.269, orthorhombic, a = 6.9128(2), b = 12.1793(5), c = 16.5363(7) Å, V = 1392.20(10) Å3, T = 298 K,
space group P212121, Z = 4, µ(Mo-Kα) = 0.10
mm-1, 9992 reflections measured, 1631 unique, R
int
= 0.032.
The final wR(F
2)
was 0.046.
<A NAME="RG19402ST-16">16</A>
Assignments of stereochemistries for 3a-c were
deduced from NOESY experiments.
<A NAME="RG19402ST-17">17</A>
Crystal data for 3c were
obtained from pure trans 3c (47%) isolated
after recrystallization in hexane.
<A NAME="RG19402ST-18">18</A>
Only one diastereomer could be detected
by 1H NMR of the crude reaction mixture.
<A NAME="RG19402ST-19">19</A>
Interplay between stereochemistry
and ion pair formation in enolates of β-dicarbonyl compounds
have been reported (ref.
[24]
).
<A NAME="RG19402ST-20">20</A>
Compound 3f was
obtained in 75% yield when Triton B was added at -90 °C,
the mixture kept at this temperature for 2 h, then r.t. 12 h.
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