卤代醇脱卤化酶(HHDH)具有混杂的环氧化物开环活性和一组带负电荷的亲核试剂,因此具有生物技术意义,能够形成C–C,C–N或C–O键。HHDH特异性序列基序的最新发现有助于从公共序列数据库中鉴定大量卤代醇脱卤酶,从而大大扩大了生物催化工具箱。在表征这些系统发育上不同的酶的17种代表的过程中,一种HHDH(即来自Ilumatobacter coccineus的HheG)被鉴定出可以转化环状环氧化物底物。该酶在氧化环己烯和氧化mon烯的叠氮反应中表现出显着的活性,周转数分别为7.8和44 s –1, 分别。正如其他HHDH所观察到的那样,氰化物介导的环氧化物开环以较低的速率进行。野生型HheG显示适度的对映选择性,因为所得到的环己烯氧化物开环的叠氮基和氰基醇的对映体过量为40%。这些生物催化发现被精制至2.3的酶的晶体结构进一步补充。对HheG的结构进行分析后发现,有一个大的开放裂隙掩盖了
[EN] NOVEL PHOSPHOROUS (V)-BASED REAGENTS, PROCESSES FOR THE PREPARATION THEREOF, AND THEIR USE IN MAKING STEREO-DEFINED ORGANOPHOSHOROUS (V) COMPOUNDS<br/>[FR] NOUVEAUX RÉACTIFS À BASE DE PHOSPHORE (V), LEURS PROCÉDÉS DE PRÉPARATION ET LEUR UTILISATION DANS LA FABRICATION DE COMPOSÉS ORGANOPHOSHOREUX (V) STÉRÉODÉFINIS
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2019200273A1
公开(公告)日:2019-10-17
The present invention relates to novel phosphorous (V) (P(V)) reagents, methods for preparing thereof, and methods for preparing organophosphorous (V) compounds by using the novel reagents.
Performance of chiral tetracarbonylmolybdenum pyrindanyl amine complexes in catalytic olefin epoxidation
作者:Patrícia Neves、Lucie S. Nogueira、Anabela A. Valente、Martyn Pillinger、Isabel S. Gonçalves、Ivo E. Sampaio-Dias、Carlos A.D. Sousa、Fabio Rizzo-Aguiar、José E. Rodríguez-Borges
DOI:10.1016/j.jorganchem.2018.01.003
日期:2018.3
Tetracarbonylmolybdenum(0) complexes of the type cis-[Mo(CO)4(L)] containing chiral 7-(1-pyrindanyl) amine ligands were prepared and found to be effective precatalysts for the epoxidation of achiral (cis-cyclooctene) and prochiral (DL-limonene and trans-β-methylstyrene) olefins at 55 °C. Epoxides were the only products formed from cis-cyclooctene (100% yield) and trans-β-methylstyrene (100% selectivity
制备了含有手性7-(1-吡喃基)胺配体的顺式-[Mo(CO)4(L)]型四羰基钼(0)配合物,发现该化合物是有效的手性环氧化物(顺式-环辛烯)和55°C下的前手性(DL-柠檬烯和反式-β-甲基苯乙烯)烯烃。环氧化合物是唯一由顺式-环辛烯(100%收率)和反式-β-甲基苯乙烯(82-85%转化率的100%选择性)形成的产物,而主要产物是由DL-柠檬烯(80-82%1,2 -在85%转化率下的环氧选择性)。回收催化剂的表征表明,预催化剂是原位转化的到含有β-辛钼酸根阴离子[ β- Mo 8 O 26 ] 4-的稳定的多氧钼酸盐,它负责催化反应。
[EN] OLIGONUCLEOTIDE COMPOSITIONS AND METHODS THEREOF<br/>[FR] COMPOSITIONS D'OLIGONUCLÉOTIDES ET PROCÉDÉS ASSOCIÉS
申请人:WAVE LIFE SCIENCES LTD
公开号:WO2021237223A1
公开(公告)日:2021-11-25
The present disclosure provides modified oligonucleotides and compositions and methods thereof. In some embodiments, provided technologies comprise modified sugars and/or modified internucleotidic linkages. In some embodiments, the present disclosure provides technologies for preparing modified oligonucleotides. In some embodiments, the present disclosure provides chirally controlled oligonucleotide compositions and methods for their preparation and uses.