References and Notes
1
Tröger J.
J. Prakt. Chem.
1887,
36:
225
2
Demeunynck M.
Tatibouet A.
Recent Developments in Tröger’s Base Chemistry, In Progress in Heterocyclic Chemistry
Vol. 11:
Gribble GW.
Gilchrist TL.
Pergamon;
Oxford, UK:
1999.
p.1
3
Bailly C.
Laine W.
Demeunynck M.
Lhomme J.
Biochem. Biophys. Res. Commun.
2000,
273:
681
4
Johnson RA.
Gorman RR.
Wnuk RJ.
Crittenden NJ.
Aiken JW.
J. Med. Chem.
1993,
36:
3202
5a
Harmata M.
Kahraman M.
Tetrahedron: Asymmetry
2000,
11:
2875
5b
Blaser HU.
Jalett HP.
Lottenbach W.
Studer M.
J. Am. Chem. Soc.
2000,
122:
12675
6
Levkin PA.
Strelenko YA.
Lyssenko KA.
Schurig V.
Kostyanovsky RG.
Tetrahedron: Asymmetry
2003,
14:
2059
7
Chen JS.
Watson WH.
Kagan J.
Agdeppa DA.
Chen S.-A.
Acta Crystallogr., Sect. B: Struct. Crystallogr. Cryst. Chem.
1978,
34:
3627
8
Molina P.
Arques A.
Tarraga A.
del Rosario Obon M.
Tetrahedron
1998,
54:
997
9
Stoncius S.
Butkus E.
Zyilinskas A.
Larsson K.
Ohrstrom L.
Berg U.
Warnmark K.
J. Org. Chem.
2004,
69:
5196
10
Naemura K.
Fukunaga R.
Komatsu M.
Yamanaka M.
Chikamatsu H.
Bull. Chem. Soc. Jpn.
1989,
62:
83
11
Harmata M.
Murray T.
J. Org. Chem.
1989,
54:
3761
12
Harmata M.
Kahraman M.
Tetrahedron Lett.
1999,
40:
4133
13
Representative Procedure for the Preparation of 6a.
To a solution of 11a (100 mg, 0.4 mmol) in benzene (10 mL) was added six drops of SOCl2. The mixture was stirred for 10 min at r.t., and the solution was then evaporated. The crude product was added to 4-hydroxycoumarin (162 mg, 1.0 mmol) and excess Et3N in benzene (10 mL). After the mixture was stirred for another 10 min at r.t., the solution was evaporated. Then, H2O (5 mL) was added to the mixture and the product was extracted twice with CH2Cl2. The combined organic extracts were dried over MgSO4, filtered and concentrated. The resulting crude product was purified by column chromatography (EtOAc-hexane, 1:9) to give a light orange solid with a 45% yield; mp 210-211 °C. 1H NMR (300 MHz, CDCl3): δ = 8.36 (d, J = 9.0 Hz, 2 H), 7.96 (dd, J = 8.1, 1.8 Hz, 1 H), 7.85 (d, J = 8.7 Hz, 2 H), 7.55 (td, J = 9.0, 1.8 Hz, 2 H), 7.32 (td, J = 6.9, 1.5 Hz, 2 H), 7.20 (td, J = 7.5, 1.5 Hz, 1 H), 6.87 (td, J = 9.3, 1.8 Hz, 2 H), 2.86 (s, 3 H), 2.41, 2.30 (ABdq, J = 13.5, 2.7 Hz, 2 H), 1.26 (t, J = 3.0 Hz, 1 H). 13C NMR (75 MHz, CDCl3): δ = 161.6, 158.2, 152.2, 148.2, 148.0, 142.7, 131.9, 127.9, 127.8, 127.4, 126.6, 124.2, 124.0, 122.2, 119.5, 116.8, 115.5, 112.3, 105.6, 92.2, 36.6, 34.6, 29.6. IR (KBr): ν = 2361, 1703, 1342, 1030 cm-1. HRMS (EI): m/z calcd for C25H18N2O5: 426.1216; found: 426.1219 [M+].
14
Representative Procedure for the Preparation of 16a.
To a solution of 15a (100 mg, 0.29 mmol) in CH2Cl2 (10 mL) was added 4-hydroxycoumarin (47 mg, 0.29 mmol) and a catalytic amount of p-TsOH. After the mixture was stirred at 80 °C for 16 h and cooled to r.t., H2O (10 mL) was added and the product was extracted twice with CH2Cl2. The combined organic extracts were dried over MgSO4, filtered and concentrated. The resulting crude product was purified by column chromatography (1:9 EtOAc-hexane) to give a yellow solid with a 85% yield; mp 317-318 °C. 1H NMR (300 MHz, CDCl3): δ = 8.38 (dd, J = 8.7, 2.4 Hz, 1 H), 8.30 (dd, J = 8.7, 2.4 Hz, 1 H), 8.02 (dd, J = 8.7, 1.8 Hz, 1 H), 7.88 (dd, J = 8.4, 1.8 Hz, 1 H), 7.61 (dd, J = 8.7, 1.8 Hz, 1 H), 7.54 (ddd, J = 8.1, 7.2, 1.8 Hz, 1 H), 7.34-7.28 (m, 2 H), 7.08 (d, J = 2.7 Hz, 1 H), 6.76 (d, J = 8.7 Hz, 1 H), 6.71 (dd, J = 8.7, 2.7 Hz, 1 H), 3.80 (s, 3 H), 3.77 (s, 1 H), 2.81 (s, 3 H), 0.94 (s, 3 H), 0.91 (s, 3 H). 13C NMR (75 MHz, CDCl3): δ = 161.9, 158.0, 153.1, 152.3, 148.0, 144.4, 136.7, 131.8, 130.2, 130.0, 127.4, 124.0, 123.5, 122.8, 122.2, 116.8, 115.2, 113.7, 113.5, 113.2, 105.8, 99.9, 55.7, 42.2, 36.3, 34.8, 23.2, 22.8. IR (KBr): ν = 2939, 1626, 1572, 1343, 1184, 811 cm-1. HRMS (EI): m/z calcd for C28H24N2O6: 484.1634; found: 484.1636 [M+].
15
Annunziata R.
Cinquini M.
Cozzi F.
Molteni V.
Schupp O.
Tetrahedron
1997,
53:
9715
16
Huang JL.
Liu HG.
Yang DY.
Bioorg. Med. Chem. Lett.
2003,
13:
927
17
Chen DU.
Kuo PY.
Yang DY.
Bioorg. Med. Chem. Lett.
2005,
15:
2665
18 Crystallographic data (excluding structure factors) for 6a and 16a have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication numbers CCDC-263524 and CCDC-263525, respectively. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, or by emailing data_request@ccdc.cam.ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336033.
19
Kimber MC.
Try AC.
Painter L.
Harding MM.
Turner P.
J. Org. Chem.
2000,
65:
3024