... SYNTHESIS AND UNUSUAL REACTION OF (1,3)PYRIMIDINO(6,9)PURINOPHANES1) Kazuo DOYAMA, Fumio HAMA, Yoshiteru SAKATA,* and Soichi The Institute ... with a,m-dibromoalkanes 7 and potassium carbonate in DMSO, however, gave only isomeric compound 3. After examining various reaction conditions, we succeeded in preparing 1 and 2 together with the non-stacking isomers 3 and 4 from the same starting material 5. MISUMI* University O ...