Total Synthesis of Jadomycin A and a Carbasugar Analogue of Jadomycin B

One's trash is another one's treasure: The first syntheses of jadomycin A and the carbasugar analogue of jadomycin B have been achieved in 6 and 20 longest linear steps, respectively. The key ring system of the aglycone was prepared by a 6π-electron electrocyclic ring closure and subsequent hemiaminal ring closure. Acid sensitivity of the glycosidic bond in jadomycin B (see structure; X=O) precluded its synthesis but led to the carbasugar analogue (X=CH2).