Expedient Preparation of Aryllithium and Arylzinc Reagents from Aryl Chlorides Using Lithium 4,4′-Di-tert-Butylbiphenylide and Zinc(II) Chloride
作者:Paul Knochel、Zhi-Liang Shen、Korbinian Sommer
DOI:10.1055/s-0034-1380697
日期:——
aryllithium and zinc reagents from inexpensive and readily available arylchlorides by using lithium 4,4′-di-tert-butylbiphenylide (LiDBB) as a lithiation reagent. The resulting organometallic reagents underwent subsequent reactions with a variety of electrophiles, such as an aldehydes, DMF, PhSSO2Ph, TsCN, an aryl halide, or an acid chloride (through Pd-catalyzed cross-coupling). Arylchlorides bearing substituents
Active energy ray sensitive resin composition, active energy ray sensitive resin film and method for forming pattern using said film
申请人:Ichimura Kunihiro
公开号:US20050227166A1
公开(公告)日:2005-10-13
An activation energy ray-sensitive composition permitting development with neutral water. Provided is an activation energy ray-sensitive composition characterized by comprising a dispersion which comprises an aqueous solution of a water-soluble resin, and an acid former dispersed in the aqueous solution in the form of fine powder, the acid former being insoluble or sparingly soluble in water and generating an acid by the action of activation energy rays, and an acid-reactive insolubilizing agent dissolved or dispersed in the dispersion and insolubilizing the water-soluble resin by the action of the acid.
Rapid Cyclic Acetal and Cyclic Ketal Synthesis Assisted by a Rotary Evaporator
作者:Fuyao Jiang、Yinzhe Chen、Qian Zhang、Weiding Wang
DOI:10.1055/a-2293-3243
日期:2024.11
Herein, we present a rapid and efficient method for synthesizing cyclicacetals and ketals utilizing a rotary evaporator. Unlike the conventional Dean–Stark dehydration process, which typically demands extended reaction times and copious amounts of organic solvents, our approach affords the synthesis of cyclicacetals and ketals with varying ring sizes in 30 min while using minimal quantities of dimethyl
Silver(I)-Catalyzed Reaction between Pyrazole and Propargyl Acetates: Stereoselective Synthesis of the Scorpionate Ligands (<i>E</i>)-Allyl-<i>gem</i>-dipyrazoles (ADPs)
作者:M. Bhanuchandra、Malleswara Rao Kuram、Akhila K. Sahoo
DOI:10.1021/jo401867e
日期:2013.12.6
The reaction between readily accessible pyrazole and propargyl acetates in the presence of Ag(I) catalyst yielded a new class of (E)-allyl-gem-dipyrazole scorpionate ligands: 1-aryl-2-N-pyrazolyl allyl acetates and 1,3-dipyrazolyl-3-arylpropene. The reaction showed broad substrate scope, and various functional and protecting groups were tolerated under the reaction conditions. The palladium(II) scorpionate complex could thus be easily prepared and successfully employed in Suzuki-Miyaura cross-couplings in water.
A Novel Approach to Dual-Acting Thromboxane Receptor Antagonist/Synthase Inhibitors Based on the Link of 1,3-Dioxane-Thromboxane Receptor Antagonists and -Thromboxane Synthase Inhibitors
作者:Norman Ackerley、Andrew G. Brewster、George R. Brown、David S. Clarke、Alan J. Foubister、Stephen J. Griffin、Julian A. Hudson、Michael J. Smithers、Paul R. O. Whittamore
DOI:10.1021/jm00010a005
日期:1995.5
A new class of dual-acting racemic thromboxane receptor antagonist/thromboxane synthase inhibitors is reported, based on the novel approach of linking the known thromboxane synthase inhibitors (TXSI) dazoxiben (2) or isbogrel(11) (separately) to thromboxane receptor antagonists (TXRA) from the 1,3-dioxane series, such as ICI 192605 (10). Dual activity was observed in vitro with inhibition of human microsomal thromboxane synthase in the range IC50 = 0.01-1.0 mu M and receptor antagonist activity by inhibition of U46619-induced human platelet aggregation in the range pA(2) = 5.5-7.0. The in vitro results also showed that very large groups could be tolerated at the selected substitution positions of the TXRA and TXSI components. Oral activity was observed in ex vivo tests in both rats and dogs at a dose of 10 mg/kg. Thus, (E)-7-[4-[[4-[(2SR,4SR,5RS)-5-[(Z)-5-carboxypent-2-enyl]-4-(2-hydroxyphenyl)-1,3-dioxan-2-yl]benzyl]oxy]phenyl]-7-(3-pyridyl)hept-6-enoic acid (110) was both an antagonist (pA(2) = 6.7) and a synthase inhibitor (IC50 = 0.02 mu M). On oral dosing (10 mg/kg) to rats and dogs, 110 showed significant TXRA activity [concentration ratio >64 (rat, 3 h) and >59 +/- 11.3 (dog, 2 h) vs ex vivo U46619-induced platelet aggregation]. Inhibition of thromboxane synthase at the respective time points in these experiments was 81 +/- 4.4% (rat) and 69 +/- 4.8% (dog).