| 摘要 |
<p>Preparation of 4-bromo-4 min -demethylepipodophyllotoxin by reacting podophyllotoxin with hydrogen bromide at about -20 DEG C. New antitumor compounds of the formula: <CHEM> wherein R is A-(CH2)n[A(CH2)n]m(CHAH)p-Q or <CHEM> each A, independently, is O, S, SO or SO2; n is an integer from 1 to 6, except when n and p, taken together, are zero, then n is 2 to 6; n is 0, 1, or 2; p is 0, 1, or 2; Q is H, alkyl from 1 to 6 carbon atoms which may be substituted with an NR1R2 group wherein each R1 and R2, independently, is selected from the group of H, alkyl containing 1 to 6 carbon atoms which may be substituted with OH, alkanoyl containing 1 to 6 carbon atoms, or R1 and R2 are interconnected and together with the N to which they are connected form an N heterocyclic ring of 5 to 6 carbon atoms; R3 is hydrogen, and R4 is an alkyl, alkenyl, cycloalkyl, 2-furyl, 2-thienyl, aryl, aralkyl, and aralkenyl, wherein the aromatic ring may optionally be substituted, preferentially by one or more of hydroxyl, alkyl, alkoxy, nitro, or halogen radicals. R3 and R4 together with the carbon atom to which they are attached may form a saturated cycloaliphatic ring having 5 or 6 carbon atoms; each X and Y, individually, is OH or NR6R7 wherein R6 and R7, independently, is H, alkyl containing 1 to 6 carbon atoms or one of R6 and R7 is acyl; and Z is <CHEM> Novel process for the preparation of the novel compounds or analogs thereof having advantageous stereoselection using alkyltin thiolates, preferably with selected solvents.</p> |
