Amberlyst-15 as a Highly Efficient and Reusable Catalyst for Direct C-S Bond Formation: Synthesis of Barbituryl Carbamodithioates
作者:Madhuri M. Sontakke、Chandrakant S. Bhaskar、Baliram N. Berad、Madhukar G. Dhonde
DOI:10.2174/1570178612666150108002716
日期:2015.2.13
The C-Sbondformation reaction has been described by the reaction of Bromo-barbituric acid with ammonium aryl dithiocarbamates in the presence of Amberlyst-15 as a reusable catalyst in aqueous medium. The mild reaction conditions, easy product isolation and good to high yields, are the major advantages of present protocol.
One-pot cascade reactions of N-acylglycines, acetic anhydride, anhydroussodiumacetate, aromatic aldehydes, and ammonium N-aryldithiocarbamates expeditiously and diastereoselectively yield 5-acylamino-3,6-diarylperhydro-2-thioxo-1,3-thiazin-4-ones (5a–j) in solvent-free conditions under microwave irradiation.
A New Route for the Convenient Synthesis of 5-Acylamino-3,6-diarylperhydro-2- thioxo-1,3-thiazin-4-ones
作者:L. D. S. Yadav、Sangeeta Sharma
DOI:10.1055/s-1992-26259
日期:——
Michael-type addition of N-aryldithiocarbamic acids 2a-c to 4-arylidene-5-oxazolones 1a-c followed by ring transformation of the resulting Michael adducts 3a-i yielded new 5-acylamino-3,6-diarylperhydro-2-thioxo-1,3-thiazin-4-ones 4a-i in one pot.
Chemoselective annulation of 1,3-dithiin, -thiazine and -oxathiin rings on thiazoles using a green protocol
作者:Lal Dhar S. Yadav、Vijai K. Rai
DOI:10.1016/j.tet.2006.06.030
日期:2006.8
es diastereoselectively yield dithioesters, thiazol-5-ylmethyl N-aryldithiocarbamates, undersolvent-freemicrowaveirradiationconditions in a one-pot procedure. Under the same conditions, the dithioesters are chemoselectively and expeditiously annulated with montmorillonite K-10 clay, Li+-montmorillonite clay and I2 to give thiazolo-1,3-dithiins, -thiazines and -oxathiins, respectively.