Various α-Oxygen Functionalizations of β-Dicarbonyl Compounds Mediated by the Hypervalent Iodine(III) Reagent<i>p</i>-Iodotoluene Difluoride with Different Oxygen-Containing Nucleophiles
作者:Jun Yu、Jun Tian、Chi Zhang
DOI:10.1002/adsc.200900737
日期:2010.2.15
for the effective introduction of variousoxygen-containing functionalities including tosyloxy, mesyloxy, acetoxy, phosphoryloxy, methoxy, ethoxy and isopropoxy at the α-position of β-dicarbonyl compounds. These transformations can be readily realized by the use of the combined reagent of p-iodotoluene difluoride and variousoxygen-containing nucleophilic compounds such as p-toluenesulfonic acid, methanesulfonic
p -Iodotoluene二氟乙烯(p -Tol-IF 2)已被发现是一种一般用于有效地引入各种含氧官能团包括甲苯磺酰氧基,甲磺酰氧基,乙酰氧基,磷酰甲氧基,乙氧基和异丙氧基在α位的试剂β-二羰基化合物。通过使用对-碘甲苯二氟化物和各种含氧亲核化合物如对甲苯磺酸,甲磺酸,乙酸,磷酸二苯酯,甲醇,乙醇和丙-2-醇的组合试剂,可以轻松实现这些转化。分别在温和的条件下。并且,原位生成的高价碘(III)物种通过在这种转化中,对-碘甲苯二氟化物与相应的含氧亲核试剂之间的配体交换被认为是真正的氧化剂。
A New Application of Hypervalent Iodine (λ<sup>5</sup>) Reagents with Organosulfonic Acids for Direct α-Organosulfonyloxylation Carbonyl Compounds
作者:Krishnacharya Akamanchi、Ulhas Mahajan
DOI:10.1055/s-2008-1072508
日期:——
Hypervalent iodine (λ 5 ) reagents in combination with P-toluenesulfonic acid when reacted with ketones under reflux temperature in acetonitrile gave α-tosyloxy ketones in moderate to excellent yields. The reaction was developed further for both ketones and dicarbonyl compounds using Dess-Martin periodinane reagent in combination with P-toluenesulfonic acid and methanesulfonic acid, to give mono-α-tosyloxy
Hypervalent iodine oxidation: α-Functionalization of β-dicarbonyl compounds using iodosobenzene
作者:Robert M. Moriarty、Radhe K. Vaid、Vasulinga T. Ravikumar、Beena K. Vaid、Thomas E. Hopkins
DOI:10.1016/s0040-4020(01)86720-x
日期:1988.1
Hypervalent iodine oxidation of β-diketones and β-ketoesters with iodosobenzene-boron trifluoride etherate in chloroform using appropriate nucleophiles results In α-functionalization. Benzoylacetone on reaction with iodosobenzene or iodosobenzene boron trifluoride-etherate in methanol yields α-methoxyacetophenone () and methyl phenylacetate (). The possible mechanisms for these reactions are discussed