描述了从五氟吡啶制备4-碘-2,3,5,6-四氟吡啶的新的和改进的方法。这种碘吡啶被用于在原位制备的4- tetrafluoropyridylcopper试剂,的1,通过两种方法。第一种方法涉及在室温下将4-四氟吡啶基镉试剂与Cu(I)Br复分解。通过在室温下在DMF中4-碘四氟吡啶与酸洗过的镉粉末之间的反应可以很容易地就地制备必需的镉试剂。第二种方法涉及4-四氟吡啶基三丁基-四氟硼酸酯与Na 2 CO 3的原位反应。室温下在DMF中加入Cu(I)Br。1在室温下容易与烯丙基卤化物,乙烯基碘化物,芳基卤化物,酰氯和炔属碘化物进行反应,以立体定向地得到相应的4-四氟吡啶基衍生物。通过Pd(0)催化4-碘四氟吡啶与1-炔烃的反应,开发出了炔烃衍生物的替代途径。
The reaction between acyl halides and alcohols: Alkyl halide vs. Ester formation
作者:Paolo Strazzolini、Angelo G. Giumanini、Giancarlo Verardo
DOI:10.1016/s0040-4020(01)80747-x
日期:1994.4
therefore, ester formation practically confined to a triggering role. But, in those cases where the cation is less easily formed, ester formation was favoured and, consequently, became the necessary elementary step towards alkylhalideformation. This final product, on the other hand, might be extremely slow to form in an SN2 reaction between the protonated ester function and the halideion. In these hnstances
Shavanov, S. S.; Tolstikov, G. A.; Miniakhmetov, I. A., Journal of Organic Chemistry USSR (English Translation), 1990, vol. 26, # 5.1, p. 837 - 840
作者:Shavanov, S. S.、Tolstikov, G. A.、Miniakhmetov, I. A.、Lomakina, S. I.、Khalilov, L. M.
DOI:——
日期:——
Preparation and reactions of the 2,3,5,6-tetrafluoropyridylcopper reagent
作者:Ba V. Nguyen、Donald J. Burton
DOI:10.1016/0022-1139(93)03058-t
日期:1994.6
4-Iodotetrafluoropyridine and 4-bromotetrafluoropyridine react readily with acid-washed cadmium or zinc powder in DMF at room temperature to give the 2,3,5,6-tetrafluoropyridylcadmium or 2,3,5,6-tetrafluoropyridylzinc reagent in quantitative yield. Metathesis of the cadmium or zinc reagent with CuBr at room temperature gives the stable 2,3,5,6-tetrafluoropyridylcopper reagent. The 2,3,5,6-tetrafluoropyridylcopper reagent couples with allylic halides, vinyl iodides, aryl iodides and acyl halides to give the corresponding adducts in high yield.
SHAVANOV, S. S.;TOLSTIKOV, G. A.;MINIAXMETOV, I. A.;LOMAKINA, S. I.;XALIL+, ZH. ORGAN. XIMII., 25,(1990) N, S. 973-978
作者:SHAVANOV, S. S.、TOLSTIKOV, G. A.、MINIAXMETOV, I. A.、LOMAKINA, S. I.、XALIL+
DOI:——
日期:——
Strazzolini Paolo, Giumanini Angelo G., Verardo Giancarlo, Tetrahedron, 50 (1994) N 1, S 217-254