References
1a
Gómez Aranda V.
Barluenga J.
Aznar F.
Synthesis
1974,
504
1b
Aznar F.
PhD
Thesis
Zaragoza;
Spain:
1975.
2
Bäckvall J.-E.
Tetrahedron
Lett.
1975,
2225
3
Chong AO.
Oshima K.
Sharpless KB.
J.
Am. Chem. Soc.
1977,
99:
3420
4a
Barluenga J.
Alonso-Cires L.
Asensio G.
Synthesis
1979,
962
4b
Barluenga J.
Aznar F.
de Mattos MCS.
Kover WB.
García-Granda S.
Pérez-Carreño E.
J.
Org. Chem.
1991,
56:
2930
5
Schofield MH.
Kee TP.
Anhaus JT.
Schrock RR.
Johnson KH.
Davis WM.
Inorg.
Chem.
1991,
30:
3595
Catalytic racemic diamination of
functionalised olefins:
6a
Jeong JU.
Tao B.
Sagasser I.
Henniges H.
Sharpless KB.
J.
Am. Chem. Soc.
1998,
120:
6844
6b
Li G.
Wei H.-X.
Kim SH.
Carducci M.
Angew. Chem. Int. Ed.
2001,
40:
4277
6c
Wei H.-X.
Kim SH.
Li G.
J. Org.
Chem.
2002,
67:
4777
7a
Lucet D.
Le Gall T.
Mioskowski C.
Angew. Chem. Int. Ed.
1998,
37:
2580
7b
Noyori R.
Ohkuma T.
Angew. Chem. Int. Ed.
2001,
40:
40
8a
Nugent WA.
Harlow RL.
McKinney RJ.
J.
Am. Chem. Soc.
1979,
101:
7265
8b
Danopoulos AA.
Wilkinson G.
Hussain-Bates B.
Hursthouse MB.
J. Chem.
Soc., Dalton Trans.
1991,
269
9a
Kolb HC.
VanNieuwenhze MS.
Sharpless KB.
Chem.
Rev.
1994,
94:
2483
9b
Kolb HC.
Sharpless KB. In Transition
Metals For Organic Chemistry: Building Blocks and Fine Chemicals
Vol.
II:
Beller M.
Bolm C.
Wiley-VCH;
Weinheim:
1998.
p.219
9c
Kolb HC.
Sharpless KB. In Transition
Metals For Organic Chemistry: Building Blocks and Fine Chemicals
Vol.
II:
Beller M.
Bolm C.
Wiley-VCH;
Weinheim:
1998.
p.243
9d
Bolm C.
Hildebrand JP.
Muñiz K. In Catalytic Asymmetric Synthesis
Ojima I.
Wiley-VCH;
Weinheim:
2000.
p.299
9e For stoichiometric asymmetric aminohydroxylation
reactions, see also: Rubenstein H.
Svendsen JS.
Acta Chem. Scand.
1994,
48:
439
10 Details on the full characterisation
of new compounds, further substrates including studies on functional
group tolerance, and X-ray structures of various racemic compounds
will be given in a full account.
11
Typical experimental
procedure for the diamination of olefins: (-)-8-Phenylmenthyl
cinnamate (181 mg, 0.5 mmol) was added to a solution of bis(N-t-butylimido)dioxo-osmium(VIII)
(183 mg, 0.5 mmol) in 5 mL of freshly distilled THF. The resulting
orange solution was stirred at r.t. for 11 h during which it turned
dark red. The solvent was removed under reduced pressure to leave
a red-brown oil which was passed through a small pad of silica gel
(hexanes-ethyl acetate, 4:1). The pure mixture of the two diastereomers
(248 mg, 0.34 mmol, 68% yield) was separated by semipreparative
HPLC (Knauer Eurospher 100CN, t-BuOCH3-n-hexane, 15:85, 14 mL/min,
254 nm). Retention times: 12.9 min for 4b and
15.6 min for 4a. Selected data for the
major diastereomer 4a: 1H
NMR (300 MHz, benzene-d
6,
25 °C): δ = 0.79 (d, J = 6.4
Hz, 3 H), 0.80-0.95 (m, 4 H), 1.08 (s, 3 H), 1.18 (s, 9
H), 1.19 (s, 9 H), 1.22 (s, 3 H), 1.43-1.55 (m, 1 H), 1.60-1.71
(m, 1 H), 2.05-2.20 (m, 2 H), 3.64 (s, 1 H), 4.77 (dt, J = 4.1, 10.7 Hz, 1 H), 4.90 (s,
1 H), 6.85-6.93 (m, 1 H), 7.01-7.28 (m, 9 H). 13C
NMR (75 MHz, benzene-d
6, 25 °C): δ = 21.9,
23.8, 26.7, 29.4, 30.2, 30.9, 31.3, 34.81, 39.5, 41.8, 50.2, 66.8,
67.4, 76.4, 81.3, 84.1, 125.4, 125.7, 127.2, 127.7, 127.9, 128.3,
128.6, 171.2. MS (EI, 70 eV): m/z (%):
728 (2) [M+], 469 (17), 413 (11),
279 (39), 146 (100). HRMS: calcd for C33H49N2O4
188Os:
724.3173, found: 724.3166.
12 Data for crystal structure analysis
were measured on a Nonius KappaCCD diffractometer. 4a:
hexagonal, P6(1) (No.169), a = 17.7617
(2), c = 18.3872 (2) Å,
V = 5023.60 (10) Å3, Z = 6, µ = 3.847
mm-1, T = 123K, 46712 reflections, 5872
unique reflections (2θmax = 50°),
R1 = 0.0273 [I> 2sigma(I)],
wR2 = 0.0613 (all data), 373 parameters and 44 restraints.
Empirical absorption correction was applied. Crystallographic data
(excluding structure factors) for the structure reported have been
deposited with the Cambridge Crystallographic Data Centre as supplementary
publication no. CCDC-192700. Copies of the data can be obtained
free of charge on application to CCDC, 12 Union Road, Cambridge
CB2 1EZ, UK (fax:+44 1223-336-033; e-mail: deposit@ccdc.cam.ac.uk)
For example:
13a
Barluenga J.
Montserrat JM.
Flórez J.
García-Granda S.
Martín E.
Angew. Chem., Int.
Ed. Engl.
1994,
33:
1392
13b
Oppolzer W.
Robbiani C.
Bättig K.
Helv.
Chim. Acta
1980,
63:
2015
13c
d’Angelo J.
Maddaluno J.
J. Am.
Chem. Soc.
1986,
108:
8112
14 At present we refrain from any mechanistic
discussion. Both a [2+2] or [3+2] mechanism
[9]
might be operating. Experimental
and theoretical investigations addressing this question are underway.
15 Apparently, this way of amide formation
is not a general reaction. While it worked well for the present
purpose, preliminary reactions indicated that it is not suitable
for conventional N-alkylated α-amino
esters. In these cases, the reaction proceeds very sluggishly and
with complete racemization (K. Muñiz, unpublished results).
16
Rubin AE.
Sharpless KB.
Angew. Chem., Int.
Ed. Engl.
1997,
36:
2637
17
Typical experimental
procedure for LiAlH
4
reduction: Osmaimidazolidine 4b (365 mg, 0.5 mmol) was dissolved in absolute
THF (4 mL), LiAlH4 (57 mg, 1.5 mmol) was added in one
portion and the resulting mixture was stirred for 2 hours at r.t.
It was treated with methanol and water, extracted with ethyl acetate,
dried over MgSO4 and filtered over celite. The solvent
was removed under reduced pressure to leave the desired compound 9 as a colourless oil (131 mg, 0.47 mmol,
94% yield). Selected data for 9: [α]D
22 = -22
(CH2Cl2, c = 0.1). 1H
NMR (300 MHz, DMSO-d
6, 25 °C): δ = 0.93
(s, 9 H), 0.97 (s, 9 H), 3.16 (dd, J = 2.6,
10.7 Hz, 1 H), 3.19-3.42 (m, 5 H), 3.80 (d, J = 7.0 Hz, 1 H), 7.19-7.47
(m, 5 H). 13C NMR (75 MHz, DMSO-d
6, 25 °C): δ = 29.9,
30.0, 49.9, 50.4, 57.58, 58.8, 61.5, 125.9, 127.4, 128.0, 147.0.
MS (EI, 70 eV): m/z (%):
278 (3) [M+], 259 (11), 222
(37), 201 (66), 166 (49), 77 (100), 65 (95). Elemental analysis:
calcd for C17H30N2O: C 73.33; H
10.86; N 10.06; found: C 73.62; H 11.01; N 9.89.
18
Typical experimental
procedure for Os removal: Osmaimidazolidine 10b (177
mg, 0.35 mmol) was dissolved in absolute ethanol (3 mL), sodium
borohydride (30 mg, 0.79 mmol) was added in small portions and the
resulting mixture was stirred for 60 min at r.t. It was filtered
over celite and the solvent was removed under reduced pressure to
leave the desired compound 11b as a colourless
oil (89 mg, 0.31 mmol, 89% yield). Selected data for 11b: [α]D
22 = -89
(CH2Cl2, c = 0.1). 1H
NMR (300 MHz, CDCl3, 25 °C): δ = 0.87
(d, J = 7.3 Hz, 3 H), 1.16 (s,
9 H), 1.26 (s, 9 H), 1.43 (s, 9 H), 2.91 (dq, J = 7.3,
9.4 Hz, 1 H), 3.47 (d, J = 9.4
Hz, 1 H), 7.52 (br s, 1 H). 13C NMR
(75 MHz, CDCl3, 25 °C):
δ = 22.7,
28.4, 29.7, 29.7, 51.8, 51.8, 52.9, 56.9, 59.3, 171.5. MS (EI, 70
eV): m/z (%): 285 (6) [M+],
228 (17), 174 (66), 125 (49), 73 (100). Elemental analysis: calcd
for C16H35N3O: C 67.32; H 12,36;
N 14.72; found: C 66. 95; H 12.22; N 15.01.
19a
Nakamura Y.
Hirai M.
Tamotsu K.
Yonezawa Y.
Shin C.-G.
Bull. Chem. Soc. Jpn.
1995,
68:
1369
19b Synthesis via aminohydroxylation: Han H.
Yoon J.
Janda KD.
J. Org. Chem.
1998,
63:
2045
20
Corey EJ.
DaSilva JP.
Virgil S.
Yuen P.-W.
Connell RD.
J.
Am. Chem. Soc.
1989,
111:
9243