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DOI: 10.1055/s-2006-939716
π-Allyl Palladium Complexes as Efficient and Powerful Alternative for Nucleophilic Substitution on Bicyclo[3.1.0]hexane Sulfonates: Regio-, Chemo- and Stereoselectivity
Publication History
Publication Date:
22 May 2006 (online)
Abstract
The preparation of cyclopropylidene bicyclo[3.1.0]hexane derivatives has been performed on both exo- and endo-bicyclo[3.1.0]hexane sulfonates, through nucleophilic substitution via π-allyl palladium complexes. While the endo- and exo-configurations do not particularly affect the selectivities of the products, on the other hand, the ‘hard’ or ‘soft’ nature of nucleophiles dramatically enhances the conservation or not of the integrity of the cyclopropane rings.
Key words
palladium - chemoselectivity - complexes - nucleophilic additions - regioselectivity - ring-opening
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References and Notes
6-Azido-1-vinylcyclohex-1-ene (
15)
1H NMR (250 MHz, CDCl3): δ = 6.33 (dd, J = 17.7, 10.9 Hz, 1 H), 6.06 (t, J = 3.9 Hz, 1 H), 5.30 (d, J = 17.7 Hz, 1 H), 5.08 (d, J = 10.9 Hz, 1 H), 4.12 (br s, 1 H), 2.32-2.00 (m, 3 H), 1.81-1.65 (m, 3 H). 13C NMR (63 MHz, CDCl3): δ = 137.4, 134.2, 132.8, 111.8, 53.9, 29.0, 25.4, 17.4. IR (neat): 2943, 2100, 1643 cm-1. MS (EI): m/z (%) = 149 (4) [M+], 120 (31), 93 (69), 91 (66), 79 (100), 77 (35). HRMS: m/z calcd for C8H11N3: 149.0952; found; 149.0950.
2-Vinylcyclohex-2-en-1-yl formate (
16)
1H NMR (250 MHz, CDCl3): δ = 8.09 (s, 1 H), 6.22 (dd, J = 17.5, 11.0 Hz, 1 H), 6.08 (t, J = 5.4 Hz, 1 H), 5.81 (m, 1 H), 5.09 (d, J = 17.5 Hz, 1 H), 4.98 (d, J = 11.0 Hz, 1 H), 2.35-1.80 (m, 3 H), 1.80-1.60 (m, 3 H). 13C NMR (90 MHz, CDCl3): δ = 160.6, 136.8, 135.1, 133.4, 111.5, 64.8, 28.5, 25.5, 17.0. IR (neat): 2945, 1718, 1647 cm-1. MS (EI): m/z (%) = 106 (95), 91 (100), 79 (35), 78 (45). MS (CI, NH3): m/z (%) = 170 (100) [M+ + 18]. HRMS (ES+):
m/z calcd for C15H22O4Na: 289.1410; found: 289.1416.
Diethyl (2-Vinylcyclohex-2-en-1-yl)malonate (
18)
1H NMR (360 MHz, CDCl3): δ = 6.21 (dd, J = 17.6, 11.2 Hz, 1 H), 5.87 (t, J = 4.0 Hz, 1 H), 5.11 (d, J = 17.6 Hz, 1 H), 4.91 (d, J = 11.2 Hz, 1 H), 4.19 (q, J = 7.2 Hz, 2 H), 4.09 (q, J = 7.2 Hz, 2 H), 3.62 (d, J = 7.9 Hz, 1 H), 3.31 (m, 1 H), 2.25-2.10 (m, 2 H), 1.90-1.65 (m, 4 H), 1.28 (t, J = 7.2 Hz, 3 H), 1.24 (q, J = 7.2 Hz, 3 H). 13C NMR (63 MHz, CDCl3): δ = 159.6, 138.6, 131.1, 114.3, 61.3, 61.1, 55.0, 54.8, 33.0, 25.7, 25.2, 18.0, 14.1, 13.9. IR (neat): 2936, 1732, 1641 cm-1. MS (EI): m/z (%) = 175 (20), 161 (67), 160 (78), 133 (44), 119 (20), 115 (24), 106 (100), 91 (93), 79 (25), 78 (34). MS (CI, NH3): m/z (%) = 267 (100) [M+ + 1], 284 (52) [M+ + 18]. HRMS (ES+): m/z calcd for C15H22O4Na: 289.1417; found: 289.1416.
Diethyl (2-Bicyclo[3.1.0]hex-6-ylideneethyl)malonate (
19)
1H NMR (360 MHz, CDCl3): δ = 5.70 (t, J = 6.6 Hz, 1 H), 4.18 (q, J = 7.2 Hz, 4 H), 3.46 (t, J = 7.5 Hz, 1 H), 2.71 (dd, J = 7.2, 6.6 Hz, 2 H), 1.92-1.65 (m, 8 H), 1.28 (t, J = 7.1 Hz, 3 H), 1.26 (t, J = 7.1 Hz, 3 H). 13C NMR (63 MHz, CDCl3): δ = 173.0, 132.9, 115.2, 61.3, 52.0, 31.0, 29.6, 29.4, 21.2, 20.7, 20.5, 14.0. IR (neat): 2938, 2863, 1750, 1733 cm-1. MS (EI): m/z (%) = 175 (37), 161 (20), 147 (37), 119 (100), 118 (44), 117 (27), 106 (51), 105 (20), 101 (33), 92 (27), 91 (81), 79 (31). MS (CI, NH3): m/z (%) = 267 (67) [M+ + 1], 284 (100) [M+ + 18]. HRMS (ES+): m/z calcd for C15H22O4Na: 289.1417; found: 289.1415.
N
-(2{(1
R
,5
S
)-Bicyclo[3.1.0]hex-6-ylidene}ethyl)-4-methyl-
N
-[(1
R
)-1-phenylethyl] Benzenesulfonamide (
21)
1H NMR (250 MHz, CDCl3): δ = 7.73 (d, J = 7.0 Hz, 4 H), 7.35-7.20 (m, 14 H), 5.52 (t, J = 6.5 Hz, 1 H, minor), 5.48 (t, J = 6.5 Hz, 1 H, major), 5.26 (q, J = 7.0 Hz, 1 H, major), 5.21 (q, J = 7.0 Hz, 1 H, minor), 3.90 (t, J = 6.5 Hz, 1 H, minor), 3.85 (t, J = 6.5 Hz, 1 H, major), 3.73 (d, J = 6.5 Hz, 1 H, major), 3.68 (d, J = 6.5 Hz, 1 H, minor), 2.45 (s, 6 H), 1.80-1.60 (m, 16 H), 1.49 (d, J = 7.0 Hz, 3 H, minor), 1.47 (d, J = 7.0 Hz, 3 H, major). 13C NMR (63 MHz, CDCl3): δ = 142.8, 140.3 (major), 140.2 (minor), 138.8 (major), 138.6 (minor), 136.8, 133.1, 131.9, 129.5, 129.2, 128.1, 128.0, 127.7, 127.5, 127.3, 127.1, 117.3 (major), 117.2 (minor), 55.5 (minor), 55.3 (major), 45.6 (minor), 45.3 (major), 29.5 (major), 29.3 (minor), 21.5 (minor), 21.3 (major), 20.9, 20.5, 17.6 (minor), 17.1 (major). IR (neat): 2939, 2863, 1599 cm-1. MS (EI): m/z (%) = 381 (3.4) [M+], 276 (20), 207 (100), 155 (21), 120 (23), 105(69), 91 (33), 79 (20). HRMS: m/z calcd for C23H27NO2S: 381.1757; found: 381.1752.