1. About the first isolation of sarkomycin from its natural source, see: (a) Umezawa, H.; Takeuchi, T.; Nitta, K.; Yamamoto, T.; Yamaoka, S. J. Antibiot. Ser. A1953, 6, 101; (b) Umezawa, H.; Takeuchi, T.; Nitta, K.; Okami, T.; Yamamoto, T.; Yamaoka, S. J. Antibiot. Ser. A1953, 6, 147. About sarkomycin structure elucidation, see: (c) Hoorper, Y. R.; Cheney, L. C.; Cron, M. J.; Fardig, O. B.; Johnson, D. A.; Johnson, D. L.; Palermiti, F. M.; Schmitz, H.; Wheatley, W. B. Antibiot. Chemother.1955, 5, 585; (d) Sato, Y.; Nishioka, S.; Yonemitsu, O.; Ban, Y. Chem. Pharm. Bull.1963, 11, 829; (e) Hill, R. K.; Foley, Jr., P. J.; Gardella, L. A. J. Org. Chem.1967, 32, 2330.
2. Some recent examples are about sarkomycin: (a) Mikolajczyk, M.; Zurawinski, R.; Kielbasinski, P.; Wieczorek, M. W.; Blaszczyk, J.; Majzner, W. R. Synthesis1997, 356; (b) Mikolajczyk, M.; Mikina, M.; Zurawinski, R. Pure Appl. Chem.1999, 71, 473. About methylenomycin A: (c) Balczewski, P.; Mikolajzyk, M. Org. Lett.2000, 2, 1153; (d) Hong, F. T.; Lee, K. S.; Liao, C. C. J. Chin. Chem. Soc.2000, 47, 77. About xanthocydin: (e) Boschelli, D.; Smith, III, A. B. Tetrahedron Lett.1981, 22, 2733. About pentenomycin: (f) Sugahara, T.; Ogasawara, K. Synlett1999 419; (g) Seepsersaud, M.; Al-Abed, Y. Tetrahedron Lett.2000, 41, 4291. About homosarkomycin: (h) Samarat, A.; Fargeas, V.; Villieras, J.; Lebreton, J.; Amri, H. Tetrahedron Lett.2001, 42, 1273.