Second-Generation Tags for Fluorous Chemistry Exemplified with a New Fluorous Mitsunobu Reagent
摘要:
A new fluorous DEAD reagent bearing two perfluoro-tert-butyloxy groups with propylene spacers shows excellent promise for use in fluorous Mitsunobu reactions. Pure target products were obtained in good yields after removing fluorous byproducts by FSPE. The new reagent serves as a prototype for a greener second generation of fluorous reagents bearing tags that are not expected to degrade in the environment to compounds that are highly persistent or that bioaccumulate in higher organisms.
Synthesis and characterization of fluorous (S)- and (R)-1-phenylethylamines that effect heat facilitated resolution of (±)-2-(8-carboxy-1-naphthylsulfinyl)benzoic acid via diastereomeric salt formation and study of their circular dichroism
diastereomeric salt(s) formed even at temperatures near to its boiling point. Compound (S)-(−)-PhCHCH3[NH(CH2)3C8F17] is found to satisfy all the latter conditions and successfully used for the heat facilitated resolution of the title racemic acid. The circular dichroism (CD) spectra of six novel fluorous (S)-(−)-1-phenylethylamine derivatives are measured in ethanol, trifluoroethanol and hexafluoropropan-2-ol
全氟烷基或nonafluoro-叔丁氧基烷基取代的具有如下结构的对映纯的PhCHCH胺3(NR 1 - [R 2)[R 1 = H,CH 3 ; R 2 =(CH 2)3 C 8 F 17,(CH 2)2 OC(CF 3)3;R 1 = R 2 =(CH 2)3 C 8 F 17,(CH 2)2 OC(CF 3)3当(S)-(-)-1-苯基乙胺与易于获得的烷基化试剂或氟2°胺(R 1 = H; R 2 =(CH 2)3 C 8 F 17, (CH 2)2 OC(CF 3)3)在Leuckart-Wallach反应中被甲基化。定性描述了这些新型手性胺及其盐酸盐在各种溶剂中的溶解度模式,游离碱的氟分配系数由GC确定。本文公开了拆分对映异构体的新方法,该方法涉及在溶剂水中使用一半当量的所选拆分剂,即使在接近其沸点的温度下,其对形成的结晶非对映体盐的溶解度也较低。化合物(S)-(-)-PhCHCH
Novel generation ponytails in fluorous chemistry: Syntheses of primary, secondary, and tertiary (nonafluoro-tert-butyloxy)ethyl amines
CH2CH2OC(CF3)3) affords the appropriate (CF3)3COCH2CH2NR1R2 amines in 20–69% yields. Improved overall yields of [(CF3)3COCH2CH2]3−nNRn to 1 were obtained by the reaction of (CF3)3CONa 2 and (XCH2CH2)3−nNRn (X = Cl, n = 0, 1, 2, R = CH3; X = CH3SO2O, n = 1, R = CH3SO2) nitrogen mustards and a similar reactive β-substituted ethyl amine. The title amines are mobile colorless liquids and volatile with steam.
(Nonafluoro-叔-butyloxy)乙基甲苯磺酸酯4以65%的产率制备从nonafluoro-叔丁醇1使用市售试剂。4与HNR 1 R 2的进一步反应(R 1 = R 2 = H,CH 3 ; R 1 = H,R 2 = CH 3,(CH 2)3 C 8 F 17,CH 2 CH 2 OC(CF 3)3)提供适当的(CF 3)3种COCH 2 CH 2 NR 1 R 2胺,产率20-69%。的改进的总产率[(CF 3)3 COCH 2 CH 2 ] 3- Ñ NR Ñ至1由反应得到的(CF 3)3 CONA 2和(XCH 2 CH 2)3- Ñ NR Ñ(X = Cl,n = 0,1,2,R = CH 3 ; X = CH 3 SO 2 O,n = 1,R = CH 3 SO 2)氮芥和类似的反应性β-取代的乙胺。标题胺是可流动的无色液体,在蒸汽中易挥发。庞大的氟马尾辫(CF
FLUORTENSIDE
申请人:Merck Patent GmbH
公开号:EP2282988A1
公开(公告)日:2011-02-16
FLUOROSURFACTANTS
申请人:Claus Eckhard
公开号:US20110088594A1
公开(公告)日:2011-04-21
The present invention relates to compounds of the formulae (I), (II) and (III), to the use of compounds containing at least one perfluoro-tert-butoxy group and at least one substituted or unsubstituted aromatic end group as surface-active agent, and to a process for the preparation of compounds of the formula (II).