Regioselective 1,4-conjugate hydrocyanation of dienones using potassium hexacyanoferrate(II) as an eco-friendly cyanide source
作者:Zheng Li、Junjun Yin、Tianpeng Li、Gong Wen、Xiaoli Shen、Jingya Yang
DOI:10.1016/j.tet.2014.06.079
日期:2014.9
highly regioselective 1,4-conjugate hydrocyanation of dienones using potassium hexacyanoferrate(II) as an original eco-friendly cyanide source, benzoyl chloride as a promoter and potassium carbonate as a catalyst is described. This protocol has advantages of non-toxic cyanatingagent, high regioselectivity, high yield, and simple work-up procedure.
Mechanochemical Assisted Chemoselective and Stereoselective Hydrogen‐Bonding Catalyzed Addition of Dithiomalonates to Enones
作者:Żaneta A. Mała、Mikołaj J. Janicki、Robert W. Góra、Krzysztof A. Konieczny、Rafał Kowalczyk
DOI:10.1002/adsc.202300636
日期:2023.10.13
be active nucleophiles in the stereoselectiveadditions to chalcones, dienones, and en-ynones affording the desired Michael adducts with moderate to good yield and enantioselectivities up to 98%. In contrast, the analogous dibenzyl malonate remained inactive. Bifunctional Cinchona squaramides secured the effective chirality transfer and the selectivity towards Michael adducts of various bisthiomalonates
Anilinderivate, Verfahren zu ihrer Herstellung und ihre Verwendung zur Bekämpfung unerwünschten Pflanzenwuchses
申请人:BASF Aktiengesellschaft
公开号:EP0081206A2
公开(公告)日:1983-06-15
Die Erfindung betrifft Anilinderivate der Formel
in der
R1, Y, A. Z und n die in der Beschreibung genannten Bedeutungen haben, Verfahren zu ihrer Herstellung und ihre Verwendung zur Bekämpfung unerwünschten Pflanzenwuchses.
本发明涉及式中 R1、Y、A、Z 和 n 具有说明中给出的含义的苯胺衍生物,涉及其制备工艺及其在防止植物不良生长方面的用途。
Synthesis and evaluation of new chalcones, derived pyrazoline and cyclohexenone derivatives as potent antimicrobial, antitubercular and antileishmanial agents
作者:Vikramdeep Monga、Kamya Goyal、Mario Steindel、Manav Malhotra、Dhanji P. Rajani、Smita D. Rajani
DOI:10.1007/s00044-013-0803-1
日期:2014.4
A series of chalcones (1-8) were prepared by Claisen-Schmidt condensation of 3-nitroacetophenone with various aldehydes. These chalcones on cyclization with hydrazine hydrate in the presence of glacial acetic acid, hydrazine hydrate in absolute ethanol and ethyl acetoacetate in the presence of barium hydroxide gave corresponding N-acetyl pyrazolines (9-16), N-unsubstituted pyrazolines (17-19) and cyclohexenone derivatives (20-22). All the synthesized compounds were evaluated for their in vitro antibacterial and antifungal activity by using broth microdilution method, and many compounds showed promising activity against various tested bacteria and fungi. Among various tested compounds, 16 and 19 exhibited strongest activities against Streptococcus pyogenes and Pseudomonas aeruginosa; both have MIC value of 25 mu g/mL, which is fourfold greater than the standard drug. Many compounds showed good activity against Candida albican. Analogs 11, 12, 15-17 and 19 displayed two- to fivefold greater activity against C. albican as compared to the standard drug. Results of antitubercular evaluation revealed that compounds 4 and 19 displayed strong antimycobacterial activity against H(37)Rv having MIC of 25 and 62.5 mu g/mL, respectively. All analogs were found to be inactive against Leishmania braziliensis except analogs 4 and 5 which exhibited strong leishmanicidal activity against Leishmania promastigotes with IC50 values of 9.3 and 8.9 mu g/mL, respectively.
Titanium Chelation in Regioselective Michael Additions to Conjugated Dienones and Trienones.
作者:Stephen J Brocchini、Richard G Lawton
DOI:10.1016/s0040-4039(97)01452-4
日期:1997.9
The site of Michael addition of beta-hetero atom substituted thiols (such as mercaptoethanol) to unsubstituted 2, 4-dienone and 2, 4, 6-trienones is at the terminal (omega) position. This site preference is transferred to the beta site when the addition is accomplished using Ti+4 complexation. These beta site addition products rapidly rearrange to the omega position on base treatment. (C) 1997 Elsevier Science Ltd.