Modular Synthesis of Furans with up to Four Different Substituents by a
<i>trans</i>
‐Carboboration Strategy
作者:Hongming Jin、Alois Fürstner
DOI:10.1002/anie.202005560
日期:2020.8.3
on treatment with MHMDS (M=Na, K), B2(pin)2, an acid chloride and a palladium/copper co‐catalyst system, undergo a reaction cascade comprised of trans‐diboration, regioselective acylation, cyclization and dehydration to give trisubstituted furylboronic acid pinacol ester derivatives in good yields; subsequent Suzuki coupling allows a fourth substituent of choice to be introduced and hence tetrasubstituted
Barium manganate in microwave-assisted oxidation reactions: synthesis of solvatochromic 2,4,6-triarylpyrimidines
作者:Mark C. Bagley、Zhifan Lin、Simon J.A. Pope
DOI:10.1016/j.tetlet.2009.09.116
日期:2009.12
Synthesis of 2,4,6-trisubstituted pyrimidines by tandem oxidation/heterocyclocondensation of propargylic alcohols and amidines is effected rapidly and efficiently under microwave dielectric heating using barium manganate as oxidant. Irradiation at 150 degrees C in ethanol-acetic acid for 45 min results in dramatic improvements in yield over the corresponding manganese dioxide-mediated method and establishes a rapid route to triarylpyrimidines in order to investigate their photophysical properties. (C) 2009 Elsevier Ltd. All rights reserved.