专利号:US-3655665-A 优先权日:1965-04-08 标 题 :Process for the production of 5-cyano-uracils 发明人:MEINDL HUBERT; ACKERMANN HANS; KAENEL FRED VON 权利人:CIBA GEIGY AG 摘要:A PROCESS FOR THE PRODUCTION OF 5-CYANO-URACILS IS DESCRIBED COMPRISING (A) RING CLOSING A COMPOUND OF THE FORMULA R1-N(-R2)-C(-R3)=C(-CN)-CO-NH-CO-NH2 IN THE PRESENCE OF AN ALKALINE CONDENSING AGENT AT A TEMPERATURE OF FROM ABOUT 30 TO 150*C., OR (B) REACTING A COMPLEX OF THE FORMULA R3-C(+)(-X)-N(-R1)-R2 Y(-) WITH CYANACETYL UREA, THEREBY OBTAINING THE COMPOUND OF HE ABOVE FORMULA B AND RING CLOSING SAID COMPOUND WITH AN ALKALINE CONDENSING AGENT. THE 5-CYANO-URACILS OBTAINED ARE VALUABLE INTERMEDIATES IN THE SYNTHESIS OF DYESTUFFS.
专利号:MX-PA02004779-A 优先权日:1999-11-12 标题:SYNTHESIS OF 2'-DEOXI-L-NUCLEOSIDS.
专利号:CN-120665019-A 优先权日:2025-06-13 标题 :Synthesis method of 2, 4-dihydroxy-5-cyanopyrimidine