Synthetic Applications of Baylis-Hillman Chemistry: An Efficient and Solely Stereoselective Synthesis of (E)-.ALPHA.-Methylcinnamic Acids and Potent Hypolipidemic Agent LK-903 from Unmodified Baylis-Hillman Adducts
Synthetic Applications of Baylis-Hillman Chemistry: An Efficient and Solely Stereoselective Synthesis of (E)-.ALPHA.-Methylcinnamic Acids and Potent Hypolipidemic Agent LK-903 from Unmodified Baylis-Hillman Adducts
Microwave-assisted synthesis of the (E)-α-methylalkenoate framework from multifunctionalized allylic phosphonium salts
作者:Lidiane Meier、Misael Ferreira、Marcus M. Sá
DOI:10.1002/hc.21001
日期:——
A convenient and general microwave-assisted method for the synthesis of stereochemicallydefined α-methylalkenoic acids and esters from allylic phosphonium salts in a basic aqueous medium is described. A selective preparation of acids or esters was dependent on the base (NaOH or NaHCO3) employed in the reaction and could be achieved with good to excellent yields under mild conditions in the absence
A Facile Zn-mediated Stereoselective Synthesis of (<i>E</i>)- and (<i>Z</i>)-Trisubstituted Alkenes from Baylis–Hillman Adducts in Water and Its Application
A simple and efficient stereoselectivesynthesis of (E)- and (Z)-trisubstituted alkenes has been accomplished by treatment of the acetyl derivatives of the Baylis-Hillmanadducts with Zn in saturated aq. NH 4 Cl solution under reflux. The method has been utilized for the preparation of the two chiral insect pheromones, dominicalure-I and dominicalure-II, of the lesser grain borer Rhyzopertha dominica
A convenient and facile stereoselectivesynthesis of (E)- and (Z)-trisubstituted alkenes has been achieved by treatment of unactivated Baylis–Hillmanadducts with NaBH4 in the presence of CuCl2·2H2O at room temperature for 15 min.
A facile one-pot stereoselective synthesis of trisubstituted (E)-2-methylalk-2-enoic acids from unactivated Baylis–Hillman adducts and a simple access to some important insect pheromones
An efficient one-pot stereoselective synthesis of trisubstituted (E)-2-methylalk-2-enoic acids has been accomplished by treatment of unactivated Baylis-Hillman adducts, 3-hydroxy-2-methylencalkanoates, with Al-NiCl2-6H(2)O in methanol at room temperature followed by hydrolysis. The method has been applied to the synthesis of three important insect pheromones, (4S,2E)-2,4-dimethyl-2-hexenoic acid, (+)-(S)-manicone and (+)-(S)-normanicone. (c) 2006 Elsevier Ltd. All rights reserved.
A FACILE ONE-POT SYNTHESIS OF METHYL(2E)-2-METHYLALK-2-ENOATES FROM BAYLIS-HILLMAN ADDUCTS UNDER MICROWAVE IRRADIATION
作者:Subramanian Ravichandran
DOI:10.1081/scc-100104425
日期:2001.1
A facile procedure for the synthesis of the title compound is described.