{"title":"恩替卡韦的合成","authors":"Y. Liping","doi":"10.1055/s-0033-1339524","DOIUrl":null,"url":null,"abstract":"Entecavir was synthesized from(1S,2S,3S,5S)-3-benzyloxy-5-[6-benzyloxy-2-(tritylamino)9H-purin-9-yl]-2-(benzyloxymethyl)-cyclopentanol by oxidation with TEMPO/I2in the presence of NaHCO3,and methylenation with Mg/TiCl4/DCM/THF to give(1S,3R,4S)-N-triphenylmethyl-6-benzyloxy-9-[[2-methylene-4benzyloxy-3-(benzyloxy)methyl]cyclopentyl]-9H-purin-2-amine(4),which was subjected to deprotection with BCl3/ MeOH/H2O with an overall yield of about 44%.","PeriodicalId":10232,"journal":{"name":"中国医药工业杂志","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Synthesis of Entecavir\",\"authors\":\"Y. Liping\",\"doi\":\"10.1055/s-0033-1339524\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Entecavir was synthesized from(1S,2S,3S,5S)-3-benzyloxy-5-[6-benzyloxy-2-(tritylamino)9H-purin-9-yl]-2-(benzyloxymethyl)-cyclopentanol by oxidation with TEMPO/I2in the presence of NaHCO3,and methylenation with Mg/TiCl4/DCM/THF to give(1S,3R,4S)-N-triphenylmethyl-6-benzyloxy-9-[[2-methylene-4benzyloxy-3-(benzyloxy)methyl]cyclopentyl]-9H-purin-2-amine(4),which was subjected to deprotection with BCl3/ MeOH/H2O with an overall yield of about 44%.\",\"PeriodicalId\":10232,\"journal\":{\"name\":\"中国医药工业杂志\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2013-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"中国医药工业杂志\",\"FirstCategoryId\":\"1089\",\"ListUrlMain\":\"https://doi.org/10.1055/s-0033-1339524\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"中国医药工业杂志","FirstCategoryId":"1089","ListUrlMain":"https://doi.org/10.1055/s-0033-1339524","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Entecavir was synthesized from(1S,2S,3S,5S)-3-benzyloxy-5-[6-benzyloxy-2-(tritylamino)9H-purin-9-yl]-2-(benzyloxymethyl)-cyclopentanol by oxidation with TEMPO/I2in the presence of NaHCO3,and methylenation with Mg/TiCl4/DCM/THF to give(1S,3R,4S)-N-triphenylmethyl-6-benzyloxy-9-[[2-methylene-4benzyloxy-3-(benzyloxy)methyl]cyclopentyl]-9H-purin-2-amine(4),which was subjected to deprotection with BCl3/ MeOH/H2O with an overall yield of about 44%.
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