retrievable nanocomposite was prepared by in situ polycondensation and entrapment of iron oxide nanoparticles. This material was found to be efficient in trapping excess electrophilic reagents such as carbonylcompounds, acid chlorides and isothiocyanates. Advantages of the new scavenger include facile preparation, high loading capacity, low cost, satisfactory swelling properties in polar solvents, and
作者:Hélène Jourdan、Géraldine Gouhier、Luc Van Hijfte、Patrick Angibaud、Serge R. Piettre
DOI:10.1016/j.tetlet.2005.09.060
日期:2005.11
Alcohols are solvents of choice to react boronates, aldehydes and either primary or secondary amines. Thus, while the reaction proceeds sluggishly, or not at all, in aprotic solvents, the desired aminoacids are in most cases obtained in high yields when conducted in methanol or hexafluoro-iso-propanol. In the case of secondary amines, microwave activation is shown to strongly accelerate the process without altering the yields. (c) 2005 Elsevier Ltd. All rights reserved.
An efficient and green La(OTf)3 catalyzed Petasis borono–Mannich reaction for the synthesis of tertiary amines
作者:Bijivemula N. Reddy、Chinthaparthi Radha Rani、S. M. Reddy、Madhvesh Pathak
DOI:10.1007/s11164-016-2551-6
日期:2016.10
tertiary amine derivatives have been prepared by a one-pot three-component Petasisborono–Mannichreaction of two different salicylaldehydes and 2-formylpyridine, substituted morpholine/piperidines and aryl boronic acids. These reactions were carried out under microwave irradiation using a catalytic amount of La(OTf)3 in a short reaction time. This procedure has the advantages of high conversions with excellent