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DOI: 10.1055/s-0028-1088108
Novel Stereocontrolled Synthesis of Highly Functionalized Cyclobutanes by Epoxide Opening through a Carbanion Intermediate in Heteroconjugate Addition
Publication History
Publication Date:
26 March 2009 (online)
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Abstract
We have demonstrated a new cyclobutane ring formation from the trans-1,2-disubstituted epoxides through intramolecular carbanion opening process. In this reaction, the nucleophilic carbanion is generated not via α-proton abstraction but via heteroconjugate addition. These studies indicate that the different configuration of each epoxide (syn and anti) do not affect its reactivity and the reaction velocity in the cyclization step, providing multifunctionalized cyclobutanes in a regio- and stereospecific manner.
Key words
heteroconjugate addition - sulfonyl carbanion - epoxides - cyclization - cyclobutanes
- Supporting Information for this article is available online:
- Supporting Information
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References and Notes
Direct generation of a carbanion by proton abstraction from α-sulfonyl group cannot be achieved due to the fact that an epoxidic proton would be abstracted to convert the epoxide into an enolate under these conditions.
20The cyclobutane ring structure of 9 was confirmed by X-ray crystallographic analysis (see Supporting Information), and other structures were confirmed through NMR spectroscopy.
21General Procudure for the Synthesis of Cyclobutane by Heteroconjugate Addition Trimethylsilylacetylene (5 equiv) was dissolved in THF and cooled to -78 ˚C under argon atmosphere. To this cold solution was added a solution of methyllithium-lithium bromide complex (4 equiv) dropwise with stirring. This stirring was continued at -78 ˚C for 30 min, and then a solution of vinylsulfone-epoxide (1 equiv) in THF was added to this mixture. After stirring for further 20 min, the reaction mixture was allowed to warm to -44 ˚C, and the temperature was kept at -44 ˚C for 40 min, then at -23 ˚C for 1 h. The reaction mixture was poured into an ice-cooled sat. aq NH4Cl. The aqueous layer was separated and extracted with Et2O. The extracts were combined, washed with H2O and brine, and then dried over Na2SO4. The solution was concentrated in vacuo, and the residue was purified by flash column chromatography to give the corresponding cyclobutane.
22Cyclobutane 9:
IR (KBr): νmax = 3448, 2957, 2858,
1448, 1284, 1252, 1134, 1117, 842 cm-¹. ¹H
NMR (600 MHz, CDCl3): δ = -0.14
(3 H, s), 0.08 (6 H, s), 0.17 (9 H, s), 0.47 (3 H, s), 0.94 (9 H,
s), 3.41 (1 H, br d, J = 8.6
Hz), 3.51 (1 H, dt, J = 11.5,
8.4 Hz), 3.63 (1 H, t, J = 9.5
Hz), 3.79 (1 H, dd, J = 9.7,
5.4 Hz), 4.27 (1 H, d, J = 8.1
Hz), 4.87 (1 H, br dt, J = 9.3,
4.8 Hz), 4.94 (1 H, d, J = 11.5
Hz), 4.98 (1 H, d, J = 4.1
Hz), 7.26 (2 H, t, J = 7.5
Hz), 7.36 (1 H, t, J = 7.5 Hz),
7.49 (2 H, t, J = 7.5
Hz), 7.61-7.68 (3 H, m), 7.91 (2 H, d, J = 7.5
Hz). ¹³C NMR (150 MHz, CDCl3): δ = -5.4, -5.4, -3.6, -2.6, -0.3,
18.3, 25.9, 45.8, 47.6, 57.4, 65.0, 70.9, 71.5, 91.6, 104.0, 127.8,
128.8, 129.0, 130.1, 134.0, 134.6, 135.8, 140.5. Anal. Calcd for
C31H48O5SSi3: C, 60.34;
H, 7.84. Found: C, 60.34; H, 7.98.
Cyclobutane 10: IR (KBr): νmax = 3493,
2956, 2172, 1428, 1247, 1147, 1023, 967, 848 cm-¹. ¹H
NMR (400 MHz, C6D6, 318 K): δ = 0.09
(6 H, s), 0.10 (9 H, s), 0.54 (3 H, s), 0.56 (3 H, s), 1.00 (9 H,
s), 2.09 (1 H, d, J = 5.4
Hz), 3.08 (1 H, ddd, J = 9.4,
7.4, 2.3 Hz), 3.30 (1 H, dd, J = 9.1,
7.2 Hz), 3.37 (1 H, t, J = 9.1
Hz), 3.46 (1 H, dd, J = 10.5,
5.0 Hz), 3.56 (1 H, dd, J = 10.5,
5.0 Hz), 4.10 (1 H, td, J = 5.0,
2.3 Hz), 4.37 (1 H, td, J = 7.2,
5.5 Hz), 7.06-7.20 (3 H, m), 7.30-7.40 (3 H, m),
7.71-7.76 (2 H, m), 7.87-7.92 (2 H, m). ¹³C
NMR (100 MHz, C6D6): δ = -5.4, -5.4, -1.7, -0.7, -0.1,
18.6, 26.1, 37.2, 48.2, 56.1, 66.5, 68.4, 71.6, 87.7, 103.8, 128.7,
128.8, 129.1, 129.9, 133.3, 133.9, 138.4, 139.6. Anal. Calcd for C31H48O5SSi3:
C, 60.34; H, 7.84. Found: C, 60.34; H, 7.96.
Cyclobutane 20: [α]D ²7 -14.5 (c 1.15, CHCl3). IR (KBr): νmax = 3525, 3031, 2172, 1305, 1148 cm-¹. ¹H NMR (400 MHz, CDCl3): δ = -0.02 (9 H, s), 0.40 (3 H, s), 0.41 (3 H, s), 2.61 (1 H, m), 2.91 (1 H, td, J = 9.0, 3.0 Hz), 2.95 (1 H, t, J = 9.0 Hz), 3.38 (2 H, d, J = 6.0 Hz), 3.48 (1 H, t, J = 9.0 Hz), 3.57 (1 H, dd, J = 11.5, 6.5 Hz), 3.64 (1 H, dd, J = 11.5, 6.5 Hz), 3.98 (1 H, td, J = 6.0, 3.0 Hz), 4.38 (1 H, d, J = 11.5 Hz), 4.44 (1 H, d, J = 11.5 Hz), 7.25-7.76 (15 H, m). ¹³C NMR (100 MHz, CDCl3): δ = -1.4, -1.1, -0.1, 27.1, 39.6, 40.8, 60.5, 64.1, 70.5, 71.9, 73.4, 87.2, 104.0, 127.9, 127.9, 127.9, 128.4, 128.4, 129.1, 129.7, 133.5, 133.6, 137.4, 137.7, 138.3. Anal. Calcd for C33H42O5SSi2: C, 65.32; H, 6.98. Found: C, 65.32; H, 7.04.
28Cyclobutane 24: [α]D
²² -34.2
(c 0.56, CHCl3). IR (KBr):
νmax = 3358,
3066, 3030, 1287, 1136 cm-¹. ¹H
NMR (400 MHz, CDCl3): δ = 0.03 (9 H,
s), 0.55-0.66 (2 H, m), 0.72-0.84 (4 H, m), 0.89
(9 H, t, J = 7.5
Hz), 2.77 (1 H, tdd, J = 10.5,
7.5, 2.5 Hz), 3.26 (1 H, ddd, J = 10.5,
6.0, 1.0 Hz), 3.69 (1 H, dd, J = 12.5,
2.5 Hz), 3.73 (1 H, dd, J = 10.0,
5.0 Hz), 3.83 (1 H, dd, J = 10.0,
5.0 Hz), 3.86 (1 H, dd, J = 12.5, 7.5
Hz), 4.20 (1 H, dd, J = 10.5,
1.0 Hz), 4.56 (1 H, d, J = 11.5
Hz), 4.61 (1 H, d, J = 11.5
Hz), 4.98 (1 H, td, J = 6.0,
3.0 Hz), 7.28-7.39 (5 H, m), 7.48-7.54 (2 H, m), 7.61-7.67
(1 H, m), 7.92-7.96 (2 H, m). ¹³C
NMR (100 MHz, CDCl3): δ = -0.4,
3.7, 8.2, 32.5, 43.2, 46.6, 60.7, 63.1, 67.6, 72.5, 73.2, 90.2,
104.8, 127.8, 127.9, 128.4, 128.9, 129.1, 133.8, 137.8, 140.9. Anal.
Calcd for C31H46O5SSi2:
C, 63.44; H, 7.90. Found: C, 63.44; H, 7.97.