[1] Battersby, A.R., Fookes, C.J.R., Matcham, G.W.J. and McDonald, E.,1980, Nature (London), 285, 17.

[2] Kräutler, B.,1987, Chimia, 41, 277.

[3] Gossauer, A., 1974, Die Chemie der Pyrrole, Springer, Berlin, 189.

[4] Jackson, A.H., 1979, Comprehensive Organic Chemistry, Sammes, P.G., (Ed.), Pergamon Press, Vol. IV, Oxford, 311.

[5] Sundberg, R.J., 1984, Comprehensive Heterocyclic Chemistry Vol. 4, Bird, C.W. and Cheeseman, G.W.H., (Eds.), Pergamon Press, Oxford, 372.

[6] Tumlinson, J.H., Silverstein, R.M., Moser, J.C., Brownlee, R.G. and Ruth, J.M.,1971, Nature (London), 234, 348.

[7] Sharma, G.M. and Burkholder, P.R.,1971, J.Chem.Soc., Chem.Commun., 151.

[8] Härri, E., Loeffler, W., Stigg, H.P., Stähelin, H., Stoll, Ch., Tamm, Ch. and Wiesinger, D.,1962, Helv.Chim.Acta, 45, 839.

[9] Edgar, J.A., Culvenor, C.C.J. and Smith, L.W.,1971, Experientia, 27, 761.

[10] Meinwald, J. and Ottenheym, H.C.J.,1971, Tetrahedron, 27, 3307.

[11] Lynn, D.G., Jaffe, K., Cornwall, M. and Tramontano, W.,1987, J.Am.Chem.Soc., 109, 5858.

[12] Imanaka, H., Kousaka, M., Tamura, G. and Arima, K.,1965, J.Antibiot.(Tokyo) Ser.A, 18, 207.

[13] Matile, P.,1987, Chimia, 41, 376.

[14] Kotzabasis, K., Breu, V. and Dörnemann, D.,1989, Biochim.Biophys.Acta, 977, 309.

[15] Hendry, G.A.F., Houghton, J.D. and Brown, S.B.,1987, New Phytol., 107, 255.

[16] Brown, S.B., Houghton, J.D. and Hendry, G.A.F., 1991, Chlorophylls, Scheer, H., (Ed.), CRC Press, Boca Raton, 465.

[17] Beale, S.I. and Weinstein, J.D., 1991, Chlorophylls, Scheer, H., (Ed.), CRC Press, Boca Raton, 385.

[18] Leeper, F.J., 1991, Chlorophylls, Scheer, H., (Ed.), CRC Press, Boca Raton, 407.

[19] Griffiths, W.T., 1991, Chlorophylls, Scheer, H., (Ed.), CRC Press, Boca Raton, 433.

[20] Rüdiger, W. and Schoch, S., 1991, Chlorophylls, Scheer, H., (Ed.), CRC Press, Boca Raton, 451.

[21] Ksander, G., Bold, G., Lattmann, R., Lehmann, C., Früh, T., Xiang, Y.-B., Inomata, K., Buser, H.-P., Schreiber, J., Zass, E. and Eschenmoser, A.,1987, Helv.Chim.Acta, 70, 1115.

[22] Mauzerall, D.,1960, J.Am.Chem.Soc., 82, 2601.

[23] Mauzerall, D.,1960, J.Am.Chem.Soc., 82, 2605.

[24] Eschenmoser, A. and Loewenthal, E.,1992, Chem.Soc.Rev., 21, 1.

[25] George, P.,1973, Ann.N.Y.Acad.Sci., 206, 84.

[26] Adler, A.D., Varadi, V. and George, P.,1974, Enzyme, 17, 43.

[27] Eschenmoser, A.,1988, Angew.Chem., 100, 5.

[28] Cheh, A.M. and Neilands, J.B.,1976, Stucture and Bonding, 29, 123.

[29] Adamczyk, M. and Reddy, R.E.,1996, Tetrahedron Lett., 37, 2325.

[30] Fishpaugh, J.R., Adamczyk, M., Heuser, K. and Reddy, R.,1996, 212th ACS National Meeting, 360.(Abstract)

[31] Rimington, C. and Krol, S.,1955, Nature (London), 175, 630.

[32] Battersby, A.R., Hunt, E., McDonald, E., Paine, J.B.III and Saunders, J.,1976, J.Chem.Soc., Perkin Trans.1, 1008.

[33] Kenner, G.W., Rimmer, J., Smith, K.M. and Unsworth, J.F.,1977, J.Chem.Soc., Perkin Trans.1, 332.

[34] 1993, Fluka. Chemika-BioChemika 1993/94, Fluka Chemie AG, Buchs.

[35] Frydman, R.B., Frydman, B. and Valasinas, A., 1979, The Porphyrins Vol. VI, Dolphin, D., (Ed.), Academic Press, New York, 1.

[36] Neier, R., 1996, Advances in Nitrogen Heterocycles Volume 2, Moody, C., (Ed.), JAI Press Inc, 35.

[37] Bobal, P. and Neier, R., 1997, Trends in Organic Chemistry Volume 6, Research Trends, Poojapura, 125.

[38] Arsenault, G.P. and MacDonald, S.F.,1961, Can.J.Chem., 39, 2043.

[39] Plieninger, H., Hess, P. and Ruppert, J.,1968, Chem.Ber., 101, 240.

[40] Jones, M.I., Froussios, C. and Evans, D.A.,1976, J.Chem.Soc., Chem.Commun., 472.

[41] Frydman, B., Reil, S., Despuy, M.E. and Rapoport, H.,1969, J.Am.Chem.Soc., 91, 2338.

[42] Demopoulos, B.J., Anderson, H.J., Loader, C.E. and Faber, K.,1983, Can.J.Chem., 61, 2415.

[43] Faber, K., Anderson, H.J., Loader, C.E. and Daley, A.S.,1984, Can.J.Chem., 62, 1046.

[44] Adamczyk, M. and Reddy, R.E.,1995, Tetrahedron Lett., 36, 7983.

[45] Adamczyk, M. and Reddy, R.E.,1995, Tetrahedron Lett., 36, 9121.

[46] Adamczyk, M. and Reddy, R.E.,1996, Tetrahedron, 52, 14689.

[47] De Leon, C.Y. and Ganem, B.,1996, J.Org.Chem., 61, 8730.

[48] Deleon, C.Y. and Ganem, B.,1997, Tetrahedron, 53, 7731.

[49] Nandi, D.L. and Shemin, D.,1968, J.Biol.Chem., 243, 1236.

[50] Fischer, H., 1943, Org.Synth.Coll.Vol. 2, 202.

[51] Fischer, H., 1943, Org.Synth.Coll.Vol. 2, 217.

[52] Mukaiyama, T.,1982, Org.React., 28, 203.

[53] Meunier, A. and Neier, R.,1988, Synthesis, 381.

[54] Rubottom, G.M., Mott, R.C. and Krueger, D.S.,1977, Synth.Commun., 7, 327.

[55] Bertschy, H., Meunier, A. and Neier, R.,1990, Angew.Chem.Int.Ed.Engl., 29, 777.

[56] Scriven, E.F.V. and Turnbull, K.,1988, Chem.Rev., 88, 298.

[57] Miller, R.D. and McKean, D.R.,1979, Synthesis, 730.

[58] Chaperon, A.R., Engeloch, T.M. and Neier, R.,1998, Angew.Chem.Int.Ed.Engl., 37, 358.

[59] Chaperon, A., 1996, Eine kurze Synthese von Porphobilinogen (PBG) - basierend auf einem biomimetischen Konzept, Thèse de Doctorat présentée à la Faculté des Sciences de l'Université de Neuchâtel, 1996,

[60] Murata, S., Suzuki, R. and Noyori, R.,1980, J.Am.Chem.Soc., 102, 3248.

[61] Mukai, C., Hashizume, S., Nagami, K. and Hanaoka, M.,1990, Chem.Pharm.Bull., 38, 1509.

[62] Davis, A.P. and Jaspars, M.,1992, Angew.Chem., 104, 475.

[63] Sakurai, H., Sasaki, K. and Hosomi, A.,1983, Bull.Chem.Soc.Jpn., 56, 3195.

[64] Franck, B. and Nonn, A.,1995, Angew.Chem., 107, 1941.

[65] Franck, B. and Nonn, A.,1995, Angew.Chem.Int.Ed.Engl., 34, 1795.

[66] Shemin, D., 1972, The Enzymes, Boyer, P.D., (Ed.), Academic Press, New York, 323.

[67] Lüönd, R.M. and Neier, R.,1995, Biochim.Biophys.Acta, 1289, 83.

[68] Jordan, P.M., 1991, Biosynthesis of Tetrapyrroles, Jordan, P.M., (Ed.), Elsevier, Amsterdam, 1.

[69] Jordan, P.M. and Seehra, J.S.,1980, J.C.S.Chem.Comm., 240.

[70] Jordan, P.M. and Seehra, J.S.,1980, FEBS Lett., 114(2), 283.

[71] Jordan, P.M. and Gibbs, P.N.B.,1985, Biochem.J., 227, 1015.

[72] Jordan, P.M., 1990, Biosynthesis of Heme and Chlorophylls, Dailey, H.A., (Ed.), McGraw-Hill, New York, 55.

[73] Lüönd, R.M., Walker, J. and Neier, R.,1992, J.Org.Chem., 57, 5005.

[74] Spencer, P. and Jordan, P.M.,1995, Biochem.J., 305, 151.

[75] Jaffe, E.K.,1993, Comments Inorg.Chem., 15, 67.

[76] Carrell, H.L., Glusker, J.P., Shimoni, L., Keefe, L.J., Afshar, C., Volin, M. and Jaffe, E.K.,1996, Acta Crystallogr D, 52, 419.

[77] Erskine, P.T., Senior, N., Awan, S., Lambert, R., Lewis, G., Tickle, I.J., Sarwar, M., Spencer, P., Thomas, P., Warren, M.J., Shoolingin-Jordan, P.M., Wood, S.P. and Cooper, J.B.,1997, Nat.Struct.Biol., 4, 1025.

[78] Warren, M.J., Cooper, J.B., Wood, S.P. and Shoolingin-Jordan, P.M.,1998, Trends Biochem.Sci., 23, 217.