A high‐yielding protocol for the synthesis of 4,
<scp>5‐diarylpyrimidin</scp>
‐2‐amine derivatives from chalcones
作者:Krishnaraj Kooramatom Unni、Prasanth K. Menon、Scholly Clair George、Sajesh P. Thomas、K. S. Devaky
DOI:10.1002/jhet.4369
日期:2022.1
A novel, high yielding and versatile protocol was achieved for the synthesis of 4,5-diaryl-2-pyrimidinamine derivativesfrom chalcones. The synthesis was accomplished by converting the chalcones into 3-chloro-2,3-diaryl-2-propen-1-ones followed by subsequent reaction with amidine derivatives.
A transition-metal-free, one-pot procedure for the synthesis of α,β-epoxy ketones by oxidative coupling of alkenes and aldehydes via base catalysis
作者:Qingping Ke、Bingyan Zhang、Bolun Hu、Yangxin Jin、Guanzhong Lu
DOI:10.1039/c4cc09260k
日期:——
A new strategy for the synthesis of epoxides is presented.
一种合成环氧化物的新策略被提出。
Asymmetric epoxidation of α,β-unsaturated ketones via an amine-thiourea dual activation catalysis
作者:Lu-Wen Zhang、Li Wang、Nan Ji、Si-Yang Dai、Wei He
DOI:10.1016/j.tetlet.2021.152941
日期:2021.3
A simple asymmetricepoxidation method is developed to effectively synthesize chiral α-carbonyl epoxides through an amine-thiourea dual activation catalysis. In this method, TBHP, as an oxidant, determined the reaction rate, and the chiral amine-thiourea catalyst effectively controlled the stereoselectivity of the reaction, and KOH promoted deprotonation. 22 examples of α,β-unsaturated ketones with
importance to synthetic chemistry. For this purpose, a mesoporous zeolite ETS‐10 (METS‐10) is synthesized by using a mesoscale silane surfactant as a template and applied to achieve highly efficient syntheses of α,β‐epoxy ketones by employing simple alkenes and aldehydes as starting materials. The high activity of the METS‐10 catalyst is attributed to its unique porous structure and basicity. Electron
Unusual Tandem Oxidative C–C Bond Cleavage and Acetalization of Chalcone Epoxides in the Presence of Iodine in Methanol
作者:Shriniwas Samant、Balaso Jadhav
DOI:10.1055/s-0033-1339134
日期:——
of chalcone epoxides is observed where chalcone epoxides on heating with iodine in methanol leads to α,α-dimethoxyacetophenones, through C–C bondcleavage followed by acetalization of the formyl group. The process occurs through ring opening of the chalcone epoxide by methanol to form β-methoxy alcohol, cleavage of the C–C bond in the latter to form α-ketoaldehyde, and acetalization of the formyl group