New Syntheses of Pyrimido[4,5-d]pyrimidines
نویسندگان
چکیده
منابع مشابه
New syntheses of 5,6- and 7,8-diaminoquinolines
The synthesis of 5,6- and 7,8-diaminoquinoline derivatives starting from angularly annelated selenadiazoloquinolones is presented. Simple chlorination of the pyridone ring followed by reductive deselenation of the 1,2,5-selenadiazole ring afforded novel 4-chloro-o-diaminoquinolines. Dechlorination of 4-chloro-7,8-diaminoquinoline gave 7,8-diaminoquinoline hydrochloride which was successfully em...
متن کاملon the comparison of keyword and semantic-context methods of learning new vocabulary meaning
the rationale behind the present study is that particular learning strategies produce more effective results when applied together. the present study tried to investigate the efficiency of the semantic-context strategy alone with a technique called, keyword method. to clarify the point, the current study seeked to find answer to the following question: are the keyword and semantic-context metho...
15 صفحه اولNew syntheses of (±)-tashiromine and (±)-epitashiromine via enaminone intermediates
The syntheses of the naturally occurring indolizidine alkaloid (±)-tashiromine and its unnatural epimer (±)-epitashiromine are demonstrated through the use of enaminone chemistry. The impact of various electron-withdrawing substituents at the C-8 position of the indolizidine core on the preparation of the bicyclic system is described.
متن کاملNew phosphonate-mediated syntheses of cyclopentanoids and prostaglandins*
This account outlines the results obtained in the author’s laboratory on the application of phosphonate reagents in the synthesis of biologically active cyclopentanones and cyclopentenones. The synthesis and reactivity of 3-phosphorylmethyl-cycloalkenones is discussed as a platform for developing the first synthesis of enantiomeric isoterreins as well as the synthesis of racemic and optically a...
متن کاملtrijiuso - Centrotetraindan - Two Syntheses of a New Centropolyindan *
Two independent syntheses of the new centrotetraindan 2, a "trifuso", C,-symmetrical isomer of fenestrindan 1, are described. The first approach is based on the "endo"-phenyldiindanone 7, which is converted into 2 by benzylation to ketone 8 and subsequent cyclodehydration with polyphoshoric acid. The second, more efficient approach is based on the diindandione 17, which is converted into ketol ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Bulletin of the Chemical Society of Japan
سال: 1973
ISSN: 0009-2673,1348-0634
DOI: 10.1246/bcsj.46.3849