three-component synthesis of 3-(2-(phenylamino)thiazol-4-yl)-2H-chromen-2-ones starting from ethyl-4-chloroacetoacetate by treating it with equimolar amounts of various phenylthioureas independently reaction with Salicylaldehyde. Use of biosynthetically prepared l-proline as an efficient catalyst and naturally extracted renewable poly(ethylene) glycol-600(PEG-600) as an effective green reaction media are
An efficient and rapid procedure for the synthesis of 2,4-disubstituted-1,3-thiazoles and selenazoles has been described by the reaction of α-bromoketones with thiourea, phenylthiourea and selenourea at ambient temperature in aqueousmediumunder ultrasonic irradiation. Analytically pure products were formed within 10–60 s in excellent yields. The advantageous features of this non-conventional methodology
Sodium fluoride as an efficient catalyst for the synthesis of 2,4-disubstituted-1,3-thiazoles and selenazoles at ambient temperature
作者:Janardhan Banothu、Krishnaiah Vaarla、Rajitha Bavantula、Peter A. Crooks
DOI:10.1016/j.cclet.2013.10.001
日期:2014.1
Abstract Sodium fluoride was found to be a simple, mild and efficient catalyst for the synthesis of 2,4-disubstituted 1,3-thiazoles and selenazoles utilizing phenacyl bromides/3-(2-bromoacetyl)-2 H -chromen-2-one and thiourea/phenylthiourea/selenourea in aqueous methanol at ambient temperature. Analytically pure products are formed within 1–3 min in excellent yields.
An efficientsynthesis of 3-[2-(arylamino)thiazol-4-yl]coumarins in excellent yields are described. Reaction of 3-(2-bromoacetyl)coumarin with potassium thiocyanate and arylamines, in alcohol resulted in the formation of title compounds in onepot. The same compounds were also prepared by grinding these coumarins and arylthiourea together.
Intramolecular Amidation: Synthesis of Novel Thiazole‐Fused Diazepinones
作者:Rajesh S. Koti、Gundurao D. Kolavi、Vinayak S. Hegde、I. M. Khazi
DOI:10.1080/00397910600978481
日期:2007.1.1
A new class of thiazole-fused diazepinones has been synthesized by the application of intramolecular hydrazonolysis, wherein 2-arylamino-4-coumarinyl5-formyl thiazoles were treated with hydrazine hydrate in refluxing ethanol to yield the rearranged products via an interesting ring-opening and cyclization process.