Palladium(II)‐Catalyzed Aminotrifluoromethoxylation of Alkenes: Mechanistic Insight into the Effect of
<i>N</i>
‐Protecting Groups
作者:Chaohuang Chen、Chuanqi Hou、Pinhong Chen、Guosheng Liu
DOI:10.1002/cjoc.201900516
日期:2020.4
An efficientpalladium‐catalyzed regioselective 5‐exo aminotrifluoromethoxylation of alkenes has been established herein, which provides a practical route towards the synthesis of OCF3‐containing pyrrolidines. tert‐Butyloxycarbonyl (Boc) as an amino protectinggroup plays a significant role in both the chemo‐ and regioselectivities. In addition, preliminary mechanistic studies reveal that the amino
Disclosed are compounds useful as inhibitors of Phosphodiesterase 1 (PDE1), compositions thereof, and methods of using the same.
揭示了作为磷酸二酯酶1(PDE1)抑制剂有用的化合物,以及它们的组合物和使用方法。
3-oxopropane-1-sulphonic acids and sulphonates
申请人:DSM N.V.
公开号:US06639103B1
公开(公告)日:2003-10-28
The invention relates to 1,3-disubstituted-3-oxopropane-1-sulfonic acids and sulfonates and enantiomerically inriched forms thereof. The invention further relates to the use of these enantiomerically inriched compounds to resolve mixtures of enantiomers, in particular mixtures of enantiomers of amino-functionalized compounds.
Aralkylation of Guanosine with Para-Substituted Styrene Oxides
作者:Thomas Barlow、Anthony Dipple
DOI:10.1021/tx970126i
日期:1998.1.1
(R)-p-bromostyrene oxide. The exocyclic positions opened the epoxide at the alpha-carbon. Epoxide ringopening by the nitrogen at the 7-position showed little preference for the alpha- or beta-carbons in reactions with p-methylstyrene oxide. However, the p-bromostyrene oxide favored reaction at the beta-carbon almost 4-fold over reaction at the alpha-carbon. Almost total inversion of stereochemistry was found
Bioproduction of Enantiopure (
<i>R</i>
)‐ and (
<i>S</i>
)‐2‐Phenylglycinols from Styrenes and Renewable Feedstocks
作者:Balaji Sundara Sekar、Jiwei Mao、Benedict Ryan Lukito、Zilong Wang、Zhi Li
DOI:10.1002/adsc.202001322
日期:2021.3.29
2 l into substituted (R)‐phenylglycinols 1 b–k and (1R, 2R)‐1‐amino‐2‐indanol 1 l in 95–>99% ee. To transform bio‐based L‐phenylalanine 6 to (R)‐1 a and (S)‐1 a, (R)‐ and (S)‐enantioselective enzyme cascades for deamination‐decarboxylation‐epoxidation‐hydrolysis‐oxidation‐transamination were developed. The engineered E. coli strains produced (R)‐1 a and (S)‐1 a in high ee at 576 mg/L and 356 mg/L, respectively