Formal Aminocyanation of α,β-Unsaturated Cyclic Enones for the Efficient Synthesis of α-Amino Ketones
作者:Chunrui Sun、Matthew J. O'Connor、Daesung Lee、Donald J. Wink、Robert D. Milligan
DOI:10.1002/anie.201309435
日期:2014.3.17
occurs through the formation of pyrazolines by means of a formal dipolar cycloaddition of cyclic α,β‐unsaturated ketones with lithium trimethylsilyldiazomethane followed by novel protonolytic NN bond cleavage under mild conditions. This two‐step process provides a diverse array of structurally complex free and mono‐alkylated α‐amino ketones in excellent yields.
Stereoselective [4 + 3] annulation of azadienes and ethyl 4-bromo-3-oxobutanoate: construction of benzindeno-fused azepine derivatives
作者:Jinhui Shen、Aimin Yu、Xiangtai Meng
DOI:10.1039/d1ob01749g
日期:——
compounds. This work reported a NaH-promoted cycloaddition between azadienes and ethyl 4-bromo-3-oxobutanoate, which delivered a series of benzindenoazepines with good yields and stereoselectivities. Such benzindenoazepine derivatives were not easily obtained by using a traditional approach. The application of this cycloaddition strategy has been extended to azadienes bearing a benzofuran or benzothiophene
苯并二氮杂环系统是一种有吸引力的生物活性化合物支架。这项工作报道了 NaH 促进的氮杂二烯和 4-溴-3-氧代丁酸乙酯之间的环加成反应,产生了一系列具有良好收率和立体选择性的苯并二氮杂卓。使用传统方法不容易获得此类苯并二氮杂卓衍生物。这种环加成策略的应用已扩展到带有苯并呋喃或苯并噻吩部分的氮杂二烯。通过克级实验和产品的合成转化展示了该方法的实用性。
Green, rapid, and highly efficient syntheses of
<i>α</i>
,
<i>α′</i>
‐bis[(aryl or allyl)idene]cycloalkanones and 2‐[(aryl or allyl)idene]‐1‐indanones as potentially biologic compounds via solvent‐free microwave‐assisted Claisen–Schmidt condensation catalyzed by MoCl
<sub>5</sub>
作者:Reza Bakhshi、Behzad Zeynizadeh、Hossein Mousavi
DOI:10.1002/jccs.201900081
日期:2020.4
A new, green, and highly efficient protocol for the expeditious preparation of some α,α′‐bis[(aryl or allyl)idene]cycloalkanones and 2‐[(aryl or allyl)idene]‐1‐indanones via a simple microwave‐assisted Claisen–Schmidt condensation reaction catalyzed by MoCl5 was successfully developed. Outstanding features of the current methodology include the use of solvent‐free conditions, simple operation, use of
The 1,3-dipolar cycloaddition of azomethine ylides derived from substituted isatins and 1,3-thiazolane-4-carboxylic acid to a series of 2-(arylmethylene)-2,3-dihydro-1H-inden-1-ones afforded twenty nine novel spiro-pyrrolothiazolyloxindoles regio- and stereoselectively in moderate yields. These compounds were screened for their in vitro activity against Mycobacterium tuberculosis H37Rv (MTB) using
This invention relates to certain 3-aryl or 3-heteroaryl pyrazoles with 4,5(3,4)-bicyclic ring fusion which are inhibitors of protein kinase activity, of which some are novel compounds, to pharmaceutical compositions containing these pyrazoles and to processes for preparing these pyrazoles.