A practical semi-synthesis of tautomycin using a hydrolysate of natural tautomycin

Tetrahedron

Volumn 59, Issue 48, 2003, Pages 9609-9617

  Kurono, Masakuni ^a   Isobe, Minoru ^a  

^a NAGOYA UNIVERSITY   (Japan)

Author keywords

Inhibitor; Proteinphosphatase; Synthesis; Tautomycin

Indexed keywords

TAUTOMYCIN;

ARTICLE; CHEMICAL REACTION; DRUG CONFORMATION; DRUG DEGRADATION; DRUG SYNTHESIS; PRIORITY JOURNAL; REACTION ANALYSIS; STRUCTURE ACTIVITY RELATION;

EID: 0242352601     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tet.2003.09.097     Document Type: Article

References (45)

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3. Protein phosphatase type 1 (PP1) and type 2A (PP2A) are two of the four major enzymes that dephosphorylate serine/threonine residues of proteins in eukaryotic cells. (a) Cohen P. Annu. Rev. Biochem. 58:1989;453-508 (b) Shenolikar S., Nairn A.C. Adv. Second Messenger Phosphoprotein Res. 23:1991;1-121.
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9. For sturcture of tautomycin, see: (a) Cheng X.-C., Ubukata M., Isono K. J. Antibiot. 43:1990;809-819 (b) Ubukata M., Cheng X.-C., Isono K. J. Chem. Soc., Chem. Commun. 1990;244-246 (c) Ubukata M., Cheng X.-C., Isobe M., Isono K. J. Chem. Soc. Perkin Trans. 1. 1993;617-624.
10. For sturcture of tautomycin, see: (a) Cheng X.-C., Ubukata M., Isono K. J. Antibiot. 43:1990;809-819 (b) Ubukata M., Cheng X.-C., Isono K. J. Chem. Soc., Chem. Commun. 1990;244-246 (c) Ubukata M., Cheng X.-C., Isobe M., Isono K. J. Chem. Soc. Perkin Trans. 1. 1993;617-624.
11. For Oikawa and Ichihara's total synthesis, see: (a) Oikawa M., Oikawa H., Ueno T., Ichihara A. Tetrahedron Lett. 30:1993;4797-4800 (b) Oikawa H., Oikawa M., Ueno T., Ichihara A. Tetrahedron Lett. 35:1994;4809-4812 (c) Oikawa M., Ueno T., Oikawa H., Ichihara A. J. Org. Chem. 60:1995;5048-5068 (d) Ueno T., Oikawa M., Oikawa H., Ichihara A. Biosci. Biotech. Biochem. 59:1995;2104-2110. For their group's structure-activity investigations, see: (e) Kawamura T., Matsuzawa S., Mizuno Y., Kikuchi K., Oikawa H., Oikawa M., Ubukata M., Ichihara A. Biochem. Pharmacol. 55:1998;995-1003 (f) Oikawa H. Curr. Med. Chem. 9:2002;2033-2054.
12. For Oikawa and Ichihara's total synthesis, see: (a) Oikawa M., Oikawa H., Ueno T., Ichihara A. Tetrahedron Lett. 30:1993;4797-4800 (b) Oikawa H., Oikawa M., Ueno T., Ichihara A. Tetrahedron Lett. 35:1994;4809-4812 (c) Oikawa M., Ueno T., Oikawa H., Ichihara A. J. Org. Chem. 60:1995;5048-5068 (d) Ueno T., Oikawa M., Oikawa H., Ichihara A. Biosci. Biotech. Biochem. 59:1995;2104-2110. For their group's structure-activity investigations, see: (e) Kawamura T., Matsuzawa S., Mizuno Y., Kikuchi K., Oikawa H., Oikawa M., Ubukata M., Ichihara A. Biochem. Pharmacol. 55:1998;995-1003 (f) Oikawa H. Curr. Med. Chem. 9:2002;2033-2054.
13. For Oikawa and Ichihara's total synthesis, see: (a) Oikawa M., Oikawa H., Ueno T., Ichihara A. Tetrahedron Lett. 30:1993;4797-4800 (b) Oikawa H., Oikawa M., Ueno T., Ichihara A. Tetrahedron Lett. 35:1994;4809-4812 (c) Oikawa M., Ueno T., Oikawa H., Ichihara A. J. Org. Chem. 60:1995;5048-5068 (d) Ueno T., Oikawa M., Oikawa H., Ichihara A. Biosci. Biotech. Biochem. 59:1995;2104-2110. For their group's structure-activity investigations, see: (e) Kawamura T., Matsuzawa S., Mizuno Y., Kikuchi K., Oikawa H., Oikawa M., Ubukata M., Ichihara A. Biochem. Pharmacol. 55:1998;995-1003 (f) Oikawa H. Curr. Med. Chem. 9:2002;2033-2054.
14. For Oikawa and Ichihara's total synthesis, see: (a) Oikawa M., Oikawa H., Ueno T., Ichihara A. Tetrahedron Lett. 30:1993;4797-4800 (b) Oikawa H., Oikawa M., Ueno T., Ichihara A. Tetrahedron Lett. 35:1994;4809-4812 (c) Oikawa M., Ueno T., Oikawa H., Ichihara A. J. Org. Chem. 60:1995;5048-5068 (d) Ueno T., Oikawa M., Oikawa H., Ichihara A. Biosci. Biotech. Biochem. 59:1995;2104-2110. For their group's structure-activity investigations, see: (e) Kawamura T., Matsuzawa S., Mizuno Y., Kikuchi K., Oikawa H., Oikawa M., Ubukata M., Ichihara A. Biochem. Pharmacol. 55:1998;995-1003 (f) Oikawa H. Curr. Med. Chem. 9:2002;2033-2054.
15. For Oikawa and Ichihara's total synthesis, see: (a) Oikawa M., Oikawa H., Ueno T., Ichihara A. Tetrahedron Lett. 30:1993;4797-4800 (b) Oikawa H., Oikawa M., Ueno T., Ichihara A. Tetrahedron Lett. 35:1994;4809-4812 (c) Oikawa M., Ueno T., Oikawa H., Ichihara A. J. Org. Chem. 60:1995;5048-5068 (d) Ueno T., Oikawa M., Oikawa H., Ichihara A. Biosci. Biotech. Biochem. 59:1995;2104-2110. For their group's structure-activity investigations, see: (e) Kawamura T., Matsuzawa S., Mizuno Y., Kikuchi K., Oikawa H., Oikawa M., Ubukata M., Ichihara A. Biochem. Pharmacol. 55:1998;995-1003 (f) Oikawa H. Curr. Med. Chem. 9:2002;2033-2054.
16. For Oikawa and Ichihara's total synthesis, see: (a) Oikawa M., Oikawa H., Ueno T., Ichihara A. Tetrahedron Lett. 30:1993;4797-4800 (b) Oikawa H., Oikawa M., Ueno T., Ichihara A. Tetrahedron Lett. 35:1994;4809-4812 (c) Oikawa M., Ueno T., Oikawa H., Ichihara A. J. Org. Chem. 60:1995;5048-5068 (d) Ueno T., Oikawa M., Oikawa H., Ichihara A. Biosci. Biotech. Biochem. 59:1995;2104-2110. For their group's structure-activity investigations, see: (e) Kawamura T., Matsuzawa S., Mizuno Y., Kikuchi K., Oikawa H., Oikawa M., Ubukata M., Ichihara A. Biochem. Pharmacol. 55:1998;995-1003 (f) Oikawa H. Curr. Med. Chem. 9:2002;2033-2054.
17. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
18. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
19. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
20. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
21. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
22. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
23. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
24. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
25. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
26. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
27. For Isobe's total synthesis, see: (a) Ichikawa Y., Naganawa A., Isobe M. Synlett. 1993;737-738 (b) Ichikawa Y., Tsuboi K., Naganawa A., Isobe M. Synlett. 1993;907-908 (c) Naganawa A., Ichikawa Y., Isobe M. Tetrahedron. 50:1994;8969-8982 (d) Jiang Y.M., Ichikawa Y., Isobe M. Synlett. 3:1995;285-288 (e) Ichikawa Y., Tsouboi K., Jiang Y., Naganawa A., Isobe M. Tetrahedron Lett. 36:1995;7101-7104 (f) Jiang Y., Isobe M. Tetrahedron. 52:1996;2877-2892 (g) Tsuboi K., Ichikawa Y., Naganawa A., Isobe M., Ubukata M., Isono K. Tetrahedron. 53:1997;5083-5102 (h) Jiang Y., Ichikawa Y., Isobe M. Tetrahedron. 53:1997;5103-5122 (i) Tsouboi K., Ichikawa Y., Jiang Y., Naganawa A., Isobe M. Tetrahedron. 53:1997;5123-5142. For his group's structure-activity investigations, see: (j) Sugiyama Y., Ohtani I.I., Isobe M., Takai A., Ubukata M., Isono K. Bioorg. Med. Chem. Lett. 6:1996;3-8 (k) Takai A., Tsuboi K., Koyasu M., Isobe M. Biochem. J. 350:2000;81-88.
28. For Shibasaki's total synthesis, see: (a) Nakamura S.-., Shibasaki M. Tetrahedron Lett. 35:1994;4145-4148 (b) Shimizu S., Nakamura S., Nakada S., Shibasaki M. Tetrahedron. 52:1996;13363-13408.
29. For Shibasaki's total synthesis, see: (a) Nakamura S.-., Shibasaki M. Tetrahedron Lett. 35:1994;4145-4148 (b) Shimizu S., Nakamura S., Nakada S., Shibasaki M. Tetrahedron. 52:1996;13363-13408.
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31. For Chamberlin's total synthesis, see: (a) Sheppeck J.E. II, Liu W., Chamberlin A.R. J. Org. Chem. 62:1997;387-398. For his group's structure-activity investigations, see: (b) Liu W., Sheppeck J.E. II, Colby D.A., Huang H.-B., Nairn A.C., Chamberlin A.R. Bioorg. Med. Chem. Lett. 13:2003;1597-1600 (c) Colby D.A., Liu W., Sheppeck J.E. II, Huang H.-B., Nairn A.C., Chamberlin A.R. Bioorg. Med. Chem. Lett. 13:2003;1601-1605.
32. For Chamberlin's total synthesis, see: (a) Sheppeck J.E. II, Liu W., Chamberlin A.R. J. Org. Chem. 62:1997;387-398. For his group's structure-activity investigations, see: (b) Liu W., Sheppeck J.E. II, Colby D.A., Huang H.-B., Nairn A.C., Chamberlin A.R. Bioorg. Med. Chem. Lett. 13:2003;1597-1600 (c) Colby D.A., Liu W., Sheppeck J.E. II, Huang H.-B., Nairn A.C., Chamberlin A.R. Bioorg. Med. Chem. Lett. 13:2003;1601-1605.
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