Heterocyclic compounds represented by the general formula (I)
wherein R stands for an optionally substituted aromatic heterocyclic group;
X stands for oxygen atom, an optionally oxidated sulfur atom, —C(═O)— or —CH(OH)—;
Y stands for CH or N;
m denotes an integer of 0 to 10:
n denotes an integer of 1 to 5:
cyclic group
stands for an optionally substituted aromatic azole group; and
ring A is optionally further substituted,
or salts thereof. The compound (I) possesses action of inhibiting tyrosine kinase and useful as antitumor agents.
Phthalonitrile undergoes partial hydration in MeOH–H2O media in the presence of an equimolar amount of NaOH to afford 2-carbamimidoylbenzoic acid in good yield in one step. This and similar vic-amidino (hetero)aromatic acids also could be synthesized from corresponding 1,2-dinitriles by hydrolysis in aqueous MeOH catalyzed by an equimolar amount of NaOH of in situ generated 1,1-dimethoxy-1H-isoindol-3-amine
High-Throughput Five Minute Microwave Accelerated Glycosylation Approach to the Synthesis of Nucleoside Libraries
作者:Brett C. Bookser、Nicholas B. Raffaele
DOI:10.1021/jo061885l
日期:2007.1.1
[GRAPHICS]The Vorbruggen glycosylation reaction was adapted into a one-step 5 min/130 degrees C microwave assisted reaction. Triethanolamine in acetontrile containing 2% water was determined to be optimal for the neutralization of trimethylsilyl triflate allowing for direct MPLC purification of the reaction mixture. When coupled with a NH3/methanol deprotection reaction, a high-throughput method of nucleoside library synthesis was enabled. The method was demonstrated by examining the ribosylation of 48 nitrogen containing heteroaromatic bases that included 25 purines, four pyrazolopyrimidines, two 8-azapurines, one 2-azapurine, two imidazopyridines, two benzimidazoles, three imidazoles, three 1,2,4-triazoles, two pyrimidines, two 3-deazapyrimidines, one quinazolinedione, and one alloxazine. Of these, 32 yielded single regioisomer products, and six resulted in separable mixtures. Seven examples provided inseparable regioisomer mixtures of -two to three compounds (16 nucleosides), and three examples failed to yield isolable products. For the 45 single isomers isolated, the average two-step overall yield +/- SD was 26 +/- 16%, and the average purity +/- SD was 95 +/- 6%. A total of 58 different nucleosides were prepared of which 15 had not previously been accessed directly from glycosylation/deprotection of a readily available base.
4, 5-imidazoledicarbonitrile and method of preparation
申请人:DU PONT
公开号:US02534331A1
公开(公告)日:1950-12-19
Baxter; Spring, Journal of the Chemical Society, 1954, p. 232