References
1
Deceased 30 August 2002.
2 For a recent example, see: Tang TP.
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Ellman JA.
J. Org. Chem.
2001,
66:
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Bloch R.
Chem.
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1407
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Merino P.
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Merchan FL.
Tejero T.
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442
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Adams JP.
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Gallagher PT.
Hunt JCA.
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9 (E)-(S)-(-)-O-(1-Phenylbutyl)benzyloxyacetaldoxime [(S)-1];
colourless oil; [α]
d
24 -6.7
(c 0.90, CHCl3); δH (300
MHz; CDCl3) 7.54 (1 H, t, J = 6.8
Hz, N=CH), 7.31 (10 H, m, ArH), 5.09 (1 H, t, J = 7.0 Hz, OCH), 4.44 (2 H,
AB, J = 12.5 Hz, CH
2Ph), 4.07 (2 H, m, CH
2CHN), 1.95 (1 H, m, CHH), 1.73 (1 H, m, CHH),
1.51-1.26 (2 H, m, CH
2Me),
0.95 (3 H, t, J = 7.3 Hz, Me); δC (75
MHz; CDCl3) 147.5 (N=CH), 142.8 (C), 137.9 (C),
128.8 (CH), 128.7 (CH), 128.4 (CH), 128.2 (CH), 127.8 (CH), 127.1
(CH), 85.6 (OCH), 72.7 (CH2), 67.1 (CH2),
38.7 (CH2), 19.3 (CH2), 14.4 (Me).
10
General procedure.
The oxime ether 1 (3.9 mmol, 1 equiv) was
dissolved in toluene (10 mL) under nitrogen and cooled to -78 °C
or -90 °C. Boron trifluoride etherate (11.8 mmol, 3
equiv) was added and the mixture stirred for 15 min. The organometallic
reagent (11.8 mmol, 3 equiv) was added dropwise over 30 min at this
temperature, and the mixture stirred until all starting material
was consumed. The reaction mixture was quenched at this temperature
with aq sat. ammonium chloride solution (10 mL), and allowed to
warm to r.t. The mixture was extracted with ether (3 × 15
mL), combined, dried (K2CO3), filtered and
evaporated. The residue was purified by column chromatography on
silica gel.
11 (R)-N-tert-Butoxycarbonyl-1-hydroxy-2-propylamine
(N-Boc-alaninol)(4a);
mp 49-50 °C (lit.,
[12]
mp
52-53 °C); [α]
d
19 +8.6
(c 0.8, CHCl3) {lit.,
[12]
[α]
d
26 +10.0
(c 1.0, MeOH)}; (S)-N-tert-butoxycarbonyl-1-hydroxy-3-phenyl-2-propylamine (N-Boc-phenylalaninol)(4c);
mp 89-91 °C (lit.,
[13]
mp
91-92 °C); [α]
d
17 -32.4
(c 1.0, CHCl3) {lit.,
[12]
[α]
d
25 -25.0
(c 1.0, MeOH)}.
12
Hamada Y.
Shibata M.
Sugiura T.
Kato S.
Shioiri T.
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Falkiewicz B.
Kolodziejczyk AS.
Liberek B.
Wisniewski K.
Tetrahedron
2001,
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14 For earlier related work, see: Hunt JCA.
Laurent P.
Moody CJ.
Chem. Commun.
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1771
15
Asano N.
Oseki K.
Tomioka E.
Kizu H.
Matsui K.
Carbohydr.
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1994,
259:
243
16
Kumareswaran R.
Hassner A.
Tetrahedron: Asymmetry
2001,
12:
3409
17 1,4-Dideoxy-1,4-imino-d-ribitol
hydrochloride salt 8; mp 124-125 °C
(lit.,
[15]
mp 130-132 °C); [α]
d
25 +53.3
(c 0.75, H2O) {lit.,
[15]
[α]
d
20+53.9
(c 1.0, H2O)}.