“…After standing at +5°o vernight the solvent was removed in vacuo to give a quantitative yield of 16: NMR (CDCI3) 1.30 (d, J = 6.0 Hz, CH3 C-5), 2.2-2.S (m, C-2 H2), 4.2-4.6 (m, C-5 H), 4.6-S.2 (m, C-3 H and C-4 H), 6.25 (m, WH = 6.0 Hz, C-l H), and 6.45 (br s, NH). 9-Deacetyl-9-(2',2'-dimethyl-4'-methoxydioxolan-4'-yl)daunomycinone (17). Adriamycinone (1 g, 2.4 mmol) in dioxane (10 ml) and CHCI3 (200 ml) was treated with dimethoxypropane (80 ml) and p-toluenesulfonic acid (0.17 g).…”