Multiple labeling of a potent CX<sub>3</sub>CR1 antagonist for the treatment of multiple sclerosis
作者:Jonas Malmquist、Peter Ström
DOI:10.1002/jlcr.2958
日期:2012.8
Several methods for the preparation of five isotopologues of the CX3CR1 antagonist 1 were developed. Volatile and radioactive 1-chloro- and 1-bromo-ethyl-benzene was handled in [2′-14C] and [3′, 5′-3H] labeling of 1. d-Leucinol ((R)-2-amino-4-methylpentan-1-ol) was labeled as [1-14C] and [4-14C] via a Wittig reaction using Garner's aldehyde and a Strecker amino acid synthesis with d-acylase resolvation, respectively. A [2H10]d-leucinol was used for the stable labeled [M + 10] isotopologue. The products were isolated with 97.6–100% stereo chemical and radiochemical purity as for specific activity 768 GBq/mmol and 1.6–2.0 GBq/mmol, respectively.
Acetic anhydride-promoted one-pot condensation of 2,4-thiazolidinedione with bisulfite adducts of aldehydes
作者:Sandeep Mohanty、Amrendra Kumar Roy、Vinay K.P. Kumar、Sandeep G. Reddy、Arun Chandra Karmakar
DOI:10.1016/j.tetlet.2014.06.082
日期:2014.8
We describe a simple and efficient one-pot method for condensing bisulfite adducts of aromatic aldehydes directly with 2,4-thiazolidinedione catalyzed by acetic anhydride. The two main highlights of this study are the one-pot condensation of bisulfite adducts with 2,4-thiazolidinedione in non-aqueous media and the use of Design of Experiment to understand and optimize the reaction conditions. This
:An efficient one pot multicomponent synthesis of 3,4- dihydropyrimidin-2(1H)-ones has been developed from aldehyde bisulfite adducts, ethyl acetoacetate and urea using recyclable polymer supported sulfonic acid catalyst. This new method provides several advantages over previous synthesis including high product yields, commercially viable, minimal workup operations and sustainable chemical practices