PubMed:2850866 JSONTXT

{"project":"sentences","denotations":[{"id":"TextSentencer_T1","span":{"begin":0,"end":108},"obj":"Sentence"},{"id":"TextSentencer_T2","span":{"begin":109,"end":606},"obj":"Sentence"},{"id":"TextSentencer_T3","span":{"begin":607,"end":737},"obj":"Sentence"},{"id":"TextSentencer_T4","span":{"begin":738,"end":958},"obj":"Sentence"},{"id":"T1","span":{"begin":0,"end":108},"obj":"Sentence"},{"id":"T2","span":{"begin":109,"end":606},"obj":"Sentence"},{"id":"T3","span":{"begin":607,"end":737},"obj":"Sentence"},{"id":"T4","span":{"begin":738,"end":958},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Synthesis and evaluation of a series of 1-(3-alkyl-2,3-dideoxy-alpha,beta-D-erythro-pentofuranosyl)thymines.\nA series of 1-(3-alkyl-2,3-dideoxy-alpha,beta-D-erythro-pentofuranosyl)thymines (3'-alkyl-3'-deoxythymidines) has been prepared from 5-O-(tert-butyldiphenylsilyl)-2,3-dideoxy-D-glycero-pent-2- enono-1,4-lactone ((S)-5-[(tert-butyldiphenylsilyl)oxymethyl]-2(5H)- furanone) by Michael addition of the appropriate organocopper reagent, followed by reduction of the lactone, acetylation of the resulting hemiacetal, and trimethylsilyl triflate-catalyzed coupling with 2,4-di-O-(trimethylsilyl)thymine. The protected nucleosides were desilylated by using tetrabutylammonium fluoride to give anomeric mixtures of the free nucleosides. The unsubstituted 2',3'-dideoxynucleoside analog was similarly prepared from 5-O-(tert-butyldiphenylsilyl)-2,3-dideoxy-D-glycero-pentono- 1,4-lactone ((S)5-[(tert-butyldiphenylsilyl)-oxymethyl]-dihydro-2(3H)-fu r anone)."}

{"project":"Anatomy-UBERON","denotations":[{"id":"T1","span":{"begin":946,"end":950},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"uberon_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/UBERON_0001037"}],"text":"Synthesis and evaluation of a series of 1-(3-alkyl-2,3-dideoxy-alpha,beta-D-erythro-pentofuranosyl)thymines.\nA series of 1-(3-alkyl-2,3-dideoxy-alpha,beta-D-erythro-pentofuranosyl)thymines (3'-alkyl-3'-deoxythymidines) has been prepared from 5-O-(tert-butyldiphenylsilyl)-2,3-dideoxy-D-glycero-pent-2- enono-1,4-lactone ((S)-5-[(tert-butyldiphenylsilyl)oxymethyl]-2(5H)- furanone) by Michael addition of the appropriate organocopper reagent, followed by reduction of the lactone, acetylation of the resulting hemiacetal, and trimethylsilyl triflate-catalyzed coupling with 2,4-di-O-(trimethylsilyl)thymine. The protected nucleosides were desilylated by using tetrabutylammonium fluoride to give anomeric mixtures of the free nucleosides. The unsubstituted 2',3'-dideoxynucleoside analog was similarly prepared from 5-O-(tert-butyldiphenylsilyl)-2,3-dideoxy-D-glycero-pentono- 1,4-lactone ((S)5-[(tert-butyldiphenylsilyl)-oxymethyl]-dihydro-2(3H)-fu r anone)."}