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公开(公告)号：US5438132A
公开(公告)日：1995-08-01
申请号：US61869
申请日：1993-05-14
IPC分类号： B01J23/46 , C07B61/00 , C07D473/18 , C07H19/00 , C01G55/00 , C07H19/067 , C07H19/167
CPC分类号： C07D473/18
摘要： A process for removing osmium from an aqueous solution of nucleosides comprising adding hydrogen sulfide, an aromatic pi base such as pyridine, and a mineral acid. The osmium is precipitated out of solution.
摘要翻译： 从核苷水溶液中除去锇的方法，包括加入硫化氢，芳族吡啶碱如吡啶和无机酸。 锇从溶液中沉淀出来。
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公开(公告)号：US4812574A
公开(公告)日：1989-03-14
申请号：US133823
申请日：1987-12-23
IPC分类号： C07B61/00 , C07D513/04 , C07D513/14
CPC分类号： C07D513/04 , C07D513/14
摘要： The invention concerns a process for preparing a thiazolo[3,2-a]benzimidazole of formula I ##STR1## in which formula n is 1 or 2, and R.sub.1 is hydrogen, lower alkyl, lower alkoxy, trifluoromethyl or halo, or a salt thereof which comprises dehydrating a compound of formula II, ##STR2## or a salt thereof wherein n and R, are as defined above, and COOR is an acid or ester function in the presence of an acid selected from sulphuric, sulphonic and phosphoric acid or mixtures thereof and if desired or required an inert solvent provided that if water is present then the amount of water is less than about 15% by volume of the acid, the reaction being carried out with heating if necessary.
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3.发明授权Synthesis of a 3,4-dihydroxy-1-cyclopentanylpurinone from a 2,3-unsaturated-1-cyclopentanylpurinone 失效3,4-二羟基-1-环戊二烯并[2,3-O-
公开(公告)号：US5233041A
公开(公告)日：1993-08-03
申请号：US772738
申请日：1991-10-07
IPC分类号： B01J23/46 , C07B61/00 , C07D473/18
CPC分类号： C07D473/18
摘要： Synthesis of the triol of formula (I) or its amine-protected derivative from a cyclopentene of the formula (II) or its amine-protected derivative: ##STR1## via steps including oxidation to the aldehyde, migration of the double bond, reduction of the aldehyde moiety back to the alcohol grouping and 1,2-cis-dihydroxylation of the double bond.
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4.发明授权
公开(公告)号：US4889936A
公开(公告)日：1989-12-26
申请号：US295410
申请日：1989-01-10
IPC分类号： C07B61/00 , C07D513/04 , C07D513/14
CPC分类号： C07D513/04 , C07D513/14
摘要： The invention concerns a process for preparng a thiazolo[3,2-a]benzimidazole of formula I ##STR1## in which formula n is 1 or 2, and R.sub.1 is hydrogen, lower alkyl, lower alkoxy, trifluoromethyl or halo, or a salt thereof which comprises dehydrating a compound of formula II, ##STR2## or a salt thereof wherein n and R, are a defined above, and COOR is an acid or ester function in the presence of an acid selected from sulphuric, sulphonic and phosphoric acid or mixtures thereof and if desired or required an inert solvent provided that if water is present then the amount of water is less than about 15% by volume of the acid, the reaction being carried out with heating if necessary.
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