A Preparative Route to Methyl 3-(Heteroaryl)acrylates Using Heck Methodology
作者:Thomas J. Kwok、Joseph A. Virgilio
DOI:10.1021/op050106k
日期:2005.9.1
Methyl 3-(heteroaryl)acrylates were prepared using Heck coupling of heteroarene halides with methyl acrylate mediated by Pd(OAc)2/P(OCH3)3. Reactions were highly efficient (reaction times between 60 and 120 min) and scalable to 100 g of heteroarene halide. The isolated yields are from 76 to 99%.
Direct Enantioselective Conjugate Addition of Carboxylic Acids with Chiral Lithium Amides as Traceless Auxiliaries
作者:Ping Lu、Jeffrey J. Jackson、John A. Eickhoff、Armen Zakarian
DOI:10.1021/ja512213c
日期:2015.1.21
Michael addition is a premier synthetic method for carbon-carbon and carbon-heteroatom bond formation. Using chiral dilithium amides as traceless auxiliaries, we report the direct enantioselective Michael addition of carboxylic acids. A free carboxyl group in the product provides versatility for further functionalization, and the chiral reagent can be readily recovered by extraction with aqueous acid. The method has been applied in the enantioselective total synthesis of the purported structure of pulveraven B.