142217-79-6Relevant articles and documents
Improved entecavir intermediate synthesis process and improved entecavir synthesis process
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, (2020/10/14)
The invention discloses an improved entecavir intermediate synthesis process and an improved entecavir synthesis process, and relates to the technical field of drug synthesis. The invention disclosesan improved entecavir intermediate synthesis process. In the synthesis process of an amino protection reaction product, amino protecting groups are added in batches; and the ratio of the reaction rawmaterials is optimized, so that the problems of long reaction time and relatively low amino protection reaction yield due to adoption of a one-time complete feeding mode in an existing synthesis modeare solved, the synthesis time of an amino protection reaction product is shortened to 50-70 minutes, and the obtained product is high in yield and purity. According to the improved entecavir synthesis process, in the amino protection reaction product synthesis process, reaction conditions are effectively optimized, and the purity of obtained entecavir reaches 99% or above.
A method for the preparation of entecavir (by machine translation)
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Paragraph 0006; 0015-0026, (2018/10/11)
The invention discloses a compound of formula (I) shown in the method for the preparation of entecavir, the method according to the following steps: shown in formula (II) intermediate of the raw materials, as shown in formula (III) of the polystyrene load the high price of iodine is the oxidizing agent, in order to of a catalytic amount of N - hydroxy imide compound as co-oxidizing agent, under the action of the additive, in formula (I). The beneficial effect of the present invention is of relatively expensive the iodine passes through polystyrene after load, can be a simple filtration recovery, recycling, the production cost is low, the preparation method is suitable for industrial production. (by machine translation)
BMS-200475, a novel carbocyclic 2'-deoxyguanosine analog with potent and selective anti-hepatitis B virus activity in vitro
Bisacchi,Chao,Bachard,Daris,Innaimo,Jacobs,Kocy,Lapointe,Martel,Merchant,Slusarchyk,Sundeen,Young,Colonno,Zahler
, p. 127 - 132 (2007/10/03)
BMS-200475, a never carbocyclic analog of 2'-deoxyguanosine, is a potent inhibitor of hepatitis B virus in vitro (ED50 = 3 nM) with relatively low cytotoxicity (CC50 = 21-120 μM). A practical 10-step asymmetric synthesis was developed affording BMS-200475 in 18% overall chemical yield and > 99% optical purity. The enantiomer of BMS-200475 as well as the adenine, thymine, and iodouracil analogs are much less active.