Synthesis of benzyl sulfides<i>via</i>substitution reaction at the sulfur of phosphinic acid thioesters
作者:Yoshitake Nishiyama、Takamitsu Hosoya、Suguru Yoshida
DOI:10.1039/d0cc02039g
日期:——
An ambident electrophilicity of phosphinicacid thioesters is disclosed. Unexpected carbon-sulfur bond formation took place in the reaction between phosphinicacid thioesters and benzyl Grignard reagents. The developed method for benzyl sulfides has a wide substrate scope and was applicable for the synthesis of a drug analog.
We have developed a simple and direct method for the synthesis of arylethers by reacting alcohols/phenols (ROH) with aryl ammonium salts (ArNMe3+), which are readily prepared fromanilines (ArNR′2, R′=H or Me). This reaction proceeds smoothly and rapidly (within a few hours) at room temperature in the presence of a commercially available base, such as KOtBu or KHMDS, and has a broad substrate scope
Preparation of arenesulphonyl chlorides from Grignard reagents
作者:S. N. Bhattacharya、C. Eaborn、D. R. M. Walton
DOI:10.1039/j39680001265
日期:——
Reaction of phenylmagnesium bromide with excess of sulphuryl chloride in ether–hexane at 0° gives benzenesulphonyl chloride and bromide in a combined yield of at least 58%. Substituted sulphonyl halides, YC6H4·SO2X (Y =o-Me, m-Me, m-Cl, and m-CF3), are produced similarly in comparable yields. Diphenylmagnesium, diphenylcadmium, or phenyl-lithium under similar conditions give somewhat smaller yields
苯基溴化镁与过量的磺酰氯在乙醚中的溶剂在0°下反应,得到的苯磺酰氯和溴化物的总收率至少为58%。类似地以可比较的产率生产取代的磺酰卤YC 6 H 4 ·SO 2 X(Y = o -Me,m -Me,m -Cl和m -CF 3)。在相似条件下,二苯基镁,二苯基镉或苯基锂的苯磺酰卤的收率要小一些。使用芳基氯化镁ArMgCl(Ar = Ph,o -MeO·C 6 H 4,p -Me 3 Si·C6 H 4和C 6 Cl 5),在四氢呋喃-己烷中,于0°产生纯的芳烃磺酰氯,产率为53-64%。
Electronic Effects and the Stereochemistries in Rearrangement−Displacement Reactions of Triaryl(halomethyl)silanes with Fluoride and with Alkoxide Ions
作者:John M. Allen、Steve L. Aprahamian、Esther A. Sans、Harold Shechter
DOI:10.1021/jo010471j
日期:2002.5.1
reacts with (halomethyl)diphenyl(para-substituted-phenyl)silanes (13, X = Cl), 14 (X = Br), and 15 (X = I) in ether solvents to give fluorodiphenyl(para-substituted-phenylmethyl)silanes (17a) and fluorophenyl(phenylmethyl)(para-substituted-phenyl)silanes (20a) by attack on silicon and migrations of the phenyl or the para-substituted-phenyl groups to C-1 with displacement of chloride ion. Sodium methoxide
A series of 2-phenylpropionic acids substituted with a C2-C6 alkenyl group at the para position was synthesized by hydrolysis of the corresponding esters prepared by a new nickel-catalyzed coupling reaction of aryl Grignard reagents and 2-bromopropionic acid ester. Among the 2-(4-alkenylphenyl)propionic acids thus obtained, 2-[4-(2-metyl-1-propenyl)phenyl]propionic acid showed the most potent antiinflammatory activity in the carrageenin edema test, while 2-[4-(3-methyl-2-butenyl)phenyl]propionic acid showed almost the same activity and significantly lower toxicity in comparison with those of ibuprofen.