Enantioselective Fluorination Mediated by Cinchona Alkaloid Derivatives/Selectfluor Combinations: Reaction Scope and Structural Information for <i>N</i>-Fluorocinchona Alkaloids
Cinchona-alkaloid/Selectfluor combinations efficiently fluorinate a variety of carbonyl compounds in a highly enantioselective manner to furnish chiral alpha-fluorocarbonyl compounds. The DHQB/Selectfluor combination is effective for the enantioselective fluorination of indanones and tetralones 1 in up to 91% ee. The first enantioselective syntheses of chiral derivatizing reagents 3 was accomplished with high ee and in
several limitations in both chemical yields and enantioselectivities of the fluorinated products. We present here the background of our personal story of the enantioselectivefluorination reaction and some successful applications of the methods to the design and synthesis of biologically active products. Two novel approaches using cinchonaalkaloid/Selectfluor® combinations and chiral ligands/metal complexes
Acylacetonitriles, process for preparation thereof and miticides containing the same
申请人:——
公开号:US20030208086A1
公开(公告)日:2003-11-06
The acylacetonitrile compound of the invention is represented by the formula (1):
1
wherein R
1
represents —C(O)ZR
2
; R
2
represents C
1-6
alkyl, C
1-4
haloalkyl or the like; Z represents oxygen or sulfur; X and Y independently represent halogen, C
1-6
alkyl or C
1-4
haloalkyl; and m and n are independently an integer of 1 to 3. The acylacetonitrile compound of the invention exhibits excellent miticidal and ovicidal activities for mites over a long period. Therefore, the acylacetonitrile compound of the invention is useful as a miticide.
Acetone Cyanohydrin as a Source of HCN in the Cu-Catalyzed Hydrocyanation of α-Aryl Diazoacetates
作者:Eun Ju Park、Seungeon Lee、Sukbok Chang
DOI:10.1021/jo100356d
日期:2010.4.16
A procedure for the Cu-catalyzed hydrocyanation of α-aryl diazoesters has been developed using acetone cyanohydrin as a source of hydrogencyanide (HCN). It was found that the addition of trimethylsilyl cyanide (TMSCN) significantly accelerates the conversion presumably by delivering free cyanide ion in situ, thus producing various types of α-aryl cyanoacetates in high yields under mild conditions