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DOI: 10.1055/s-2004-837213
Unexpected cis-Selectivity in (Sylvestre) Julia Olefinations with Bu3Sn-Containing Allyl Benzothiazolyl Sulfones: Stereoselective Synthesis of 1,3-Butadienyl- and 1,3,5-Hexatrienylstannanes
Publication History
Publication Date:
17 December 2004 (online)
Abstract
Bu3Sn-substituted benzothiazolyl sulfones 1c, 1d, and 1f were subjected to Julia olefination reactions with a variety of aldehydes. cis-Selectivities up to 97:3 were obtained by using KHMDS as base in THF.
Key words
alkenylstannanes - dienes - Julia-Lythgoe olefination - stereoselectivity - trienes
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1a First report:
Julia M.Paris J.-M. Tetrahedron Lett. 1973, 4833 -
1b Stereochemical investigations:
Kocienski PJ.Lythgoe B.Ruston S. J. Chem. Soc., Perkin Trans. 1 1978, 829 -
1c
Kocienski PJ.Lythgoe B.Waterhouse I. J. Chem. Soc., Perkin Trans. 1 1980, 1045 -
2a A cis-selective variant of the (Marc) Julia-Lythgoe olefination was reported, too:
Bremmer J.Julia M.Launay M.Stacino JP. Tetrahedron Lett. 1982, 23: 3265 -
2b
Julia M.Lauron H.Stacino JP.Verpeaux JN.Jeannin Y.Dromzee Y. Tetrahedron 1986, 42: 2475 -
2c Select applications:
Julia M.Stacino JP. Tetrahedron 1986, 42: 2469 -
2d
Cuvigny T.Dupenhoat CH.Julia M. Tetrahedron 1987, 43: 859 -
2e
Holmes AB.Pooley GR. Tetrahedron 1992, 48: 7775 -
3a First report:
Baudin JB.Hareau G.Julia SA.Ruel O. Tetrahedron Lett. 1991, 32: 1175 -
3b Stereochemical studies:
Baudin JB.Hareau G.Julia SA.Ruel O. Bull. Soc. Chim. Fr. 1993, 130: 336 -
3c
Baudin JB.Hareau G.Julia SA.Lorne R.Ruel O. Bull. Soc. Chim. Fr. 1993, 130: 856 -
3d For an exception see:
Bellingham R.Jarowicki K.Kocienski P.Martin V. Synthesis 1996, 285 : A 71:29 cis:trans ratio was observed for the hexatrienes resulting from an a-lithioallyl benzothiazolyl sulfone and an a,b-unsaturated aldehyde. This ratio was increased to 82:18 employing the a-potassioallyl benzothiazolyl sulfone -
3e Note added in proof: A 75:25 cis:trans ratio has been published recently for the (Sylvestre) Julia olefination of a multiply conjugated aldehyde with an α-sodiopentadienyl benzothiazolyl sulfone:
Furuichi N.Hara H.Osaki T.Nakano M.Mori H.Katsumura S. J. Org. Chem. 2004, 69: 7949 - 4 (Sylvestre) Julia olefinations with the sodium derivatives of cyclopropylcarbinyl benzothiazolyl sulfone are a notable exception showing solvent-dependent trans:cis ratios (78:22 in DMF - 9:91 in toluene or CH2Cl2):
Charette AB.Lebel H. J. Am. Chem. Soc. 1996, 118: 10327 - 5 Modified (Sylvestre) Julia olefinations with alkyl N-phenyltetrazolyl sulfones:
Blakemore PR.Cole WJ.Kocienski PJ.Morley A. Synlett 1998, 26 - 6 Modified (Sylvestre) Julia olefinations with alkyl N-tert-butyltetrazolyl sulfones:
Kocienski PJ.Bell A.Blakemore PR. Synlett 2000, 365 -
7a Modified (Sylvestre) Julia olefinations with alkyl 2-pyridyl sulfones:
Charette AB.Bethelette C.St-Martin D. Tetrahedron Lett. 2001, 42: 5149 -
7b Corrigendum:
Charette AB.Bethelette C.St-Martin D. Tetrahedron Lett. 2001, 42: 6619 - 8 Review:
Blakemore PR. J. Chem. Soc., Perkin Trans. 1 2002, 2563 - 9
Kende AS.Mendoza JS. Tetrahedron Lett. 1990, 31: 7105 -
10a
Lankat R. Diplomarbeit Universität Würzburg: 1992. p.25 -
10b
Lankat R. Diplomarbeit Universität Würzburg: 1992. p.28 - 11
Vaz B.Alvarez R.de Lera AR. J. Org. Chem. 2002, 67: 5040 -
12a
Brückner R.Siegel K.Sorg A. In Strategies and Tactics in Organic Synthesis Vol. 5:Harmata M. Elsevier; Amsterdam: 2004. p.437-473 -
12b
Sorg, A.; Siegel, K.; Brückner, R. Chem.-Eur. J. in press.
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16a H2O2 oxidation/Mo(VI) catalysis:
Schultz HS.Freyermuth HB.Buc SR. J. Org. Chem. 1963, 28: 1140 -
16b
H2O2 oxidation/(NH4)6Mo7O24 catalysis: see ref.3b
- 17
Still WC.Kahn M.Mitra A. J. Org. Chem. 1978, 43: 2923 - 19
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Rzasa RM.Shea HA.Romo D. J. Am. Chem. Soc. 1998, 120: 591 - 22
Kiehl A.Eberhardt A.Adam M.Enkelmann V.Müllen K. Angew. Chem., Int. Ed. Engl. 1992, 31: 1588 ; Angew. Chem. 1992, 104, 1623 - 23
Brückner S.Abraham E.Klotz P.Suffert J. Org. Lett. 2002, 4: 3391 - 24
Lipshutz BH.Lindsley C. J. Am. Chem. Soc. 1997, 119: 4555 - 25
Siegel K.Brückner R. Synlett 1999, 1227 - 26
Domon L.Uguen D. Tetrahedron Lett. 2000, 41: 5501 - 27
Lipshutz BL.Lee JI. Tetrahedron Lett. 1991, 32: 7211 - 28
Alvarez R.Herrero M.Lopez S.de Lera AR. Tetrahedron 1998, 54: 6793
References
3,8-Dimethyl-1,10-bis(tributylstannyl)-1,3,5,7,9-decapentaene as a 94:6 mixture of cis-3 and trans-3: At
-78 °C KHMDS (1.0 M in THF, 0.26 mL, 0.26 mmol, 1.12 equiv) was added to a solution of sulfone 1f (147.3 mg, 0.259 mmol, 1.12 equiv) and aldehyde 2 (89.0 mg, 0.231 mmol, 1.00 equiv) in THF (1.5 mL), resulting in a purple solution. This solution was warmed to r.t. over a period of 2 h. Pentane (4 mL) and brine (2 mL) were added. The aqueous phase was extracted with pentane (2 × 2 mL) and the combined organic extracts were washed with brine (2 mL). After drying with Na2SO4 the solvent was removed in vacuo. Flash chromatography [Al2O3 (deactivated with 3% H2O), cyclohexane: Et3N = 200:2] afforded the title compound (142.2 mg, 63%; ref.
[11]
: 83%) as a 94:6 mixture of cis-3 and trans-3 as a yellow oil. IR (film): n = 2955, 2925, 2870, 2855, 1560, 1465, 1455, 1375, 1070, 1005, 980, 960, 880, 875, 865, 760, 690, 665, 595 cm-1. 1H NMR (499.9 MHz, C6HD5 as internal standard in C6D6): δ = ca. 0.91-1.09 (m, 6 × SnCH
2
CH2CH2CH3), in part superimposed by 0.93 (t, J
vic = 7.3 Hz, 6 × SnCH2CH2CH2CH
3
), 1.38 (tq, both J
vic = 7.6 Hz, 6 × SnCH2CH2CH
2
CH3), 1.54-1.72 (m, 6 × SnCH2CH
2
CH2CH3), 1.87 (d, J
allyl = 0.6 Hz, 3-CH3, 8-CH3), 6.44 (mc, 5-H, 6-H), 6.53 (d, J
1,2 and J
10,9 = 19.1 Hz, flanked by Sn isotope satellites as 2 interlocked d, 2
J
¹¹9
Sn,H = 69.8 Hz, 2
J
¹¹7
Sn,H = 66.3 Hz, 1-H, 10-H), 6.85 (br d, J
4,5 and J
7,6 = 8.2 Hz, 4-H, 7-H), 6.94 (d, J
2,1 and J
9,10 = 19.2 Hz, flanked by Sn isotope satellites as 2 interlocked d, 3
J
¹¹9
Sn,H = 64.9 Hz, 3
J
¹¹7
Sn,H = 62.1 Hz, 2-H, 9-H). 13C NMR (125.7 MHz, C6HD5 as internal standard in C6D6): δ = 9.89 (flanked by Sn isotope satellites as 2 d, 1
J
¹¹9
Sn,C-1
′′ = 342.1 Hz, 1
J
¹¹7
Sn,C-1
′′ = 327.0 Hz, SnCH2CH2CH2CH3), 12.01 (3-CH3, 8-CH3), 13.90 (SnCH2CH2CH2
CH
3
), 27.69 (flanked by Sn isotope satellites as 1 d, 3
J
¹¹9
Sn,C-3
′′ = 3
J
¹¹7
Sn,C-3
′′ = 54.2 Hz, SnCH2CH2
CH2CH3), 29.58 (flanked by Sn isotope satellites as 1 d, 2
J
¹¹9
Sn,C-2
′′ = 2
J
¹¹7
Sn,C-2
′′ = 20.6 Hz, SnCH2
CH2CH2CH3), 126.63 (C-5, C-6), 126.93 (C-4, C-7), 128.93 (C-1, C-10), 137.95 (half intensity, C-3, C-8), 151.69 (flanked by Sn isotope satellites as 1 d, 2
J
¹¹9
Sn,C-2 = 2
J
¹¹7
Sn,C-2 and 2
J
¹¹9
Sn,C-9 = 2
J
¹¹7
Sn,C-9 = 10.9 Hz, C-2, C-9). The cis configuration of the C5=C6 double bond was proved by an edited HSQC experiment (‘1H-coupled short-range H,C-COSY’, 499.9/125.7 MHz, C6D6): The 13C signal at δ = 126.63 (C-5/C-6), split by 1
J
C-5,5-H = 1
J
C-6,6-H = 155.8 Hz, revealed the H,H coupling constants J
5,4 = J
5,6 and J
6,7 =
J
6,5 = 11.2 Hz. HRMS (EI, 70 eV): m/z = 681.26813 [M+ - Bu], which is 3.89 ppm more than calcd for C32H59Sn2 (m/z = 681.26548).
Sorg, A. Dissertation; Universität Freiburg, 2004.
15All new compounds gave satisfactory 1H NMR and 13C NMR spectra and provided correct combustion analyses or high resolution mass spectra.
18Cis:trans ratios up to >99:1 for (Sylvestre) Julia olefinations of pentanal or octanal with (γ-butylpropargyl) benzothiazolyl sulfone, LiBr, and LDA in THF: see ref.3c
20After terminating the present study, we learned that Professor de Lera and associates observed cis-selective (Sylvestre) Julia olefinations, too, starting from a series of polyenyl benzothiazolyl sulfones including sulfone 1f. In their study, these authors (Vaz, B.; Alvarez, R.; Souto, J. A.; de Lera, A. R. Synlett 2005, following paper) had independently revised the stereochemical outcome of their olefination 1f + 2 → 3 in favor of the selectivity depicted in Scheme [1] .