A transition-metal-free, facile and efficient method for the synthesis of 3-alkynylpyrrole-2,4-dicarboxylates from methylene isocyanides and propiolaldehyde with moderate to good yields has been developed. The direct transformation process and good tolerance of various substituents make it an alternative approach to previous protocols, and potential applications of these investigated compounds are
Synthesis of C3-alkenylated 2,3,4-trisubstituted pyrrole derivatives through cyclization of methylene isocyanides and ene–yne–ketones
作者:Shasha Li、Gongruixue Zeng、Xiaoqi Xing、Zhiheng Yang、Feiyun Ma、Boxia Li、Weiyan Cheng、Jiankang Zhang、Ruoyu He
DOI:10.1039/d0nj05253a
日期:——
A mild, transition-metal-free and facile C3-alkenylated 2,3,4-trisubstituted pyrrole cyclization of methylene isocyanides with ene–yne–ketones in moderate to good yields was explored.
Enantioselective synthesis of chiral oxazolines from unactivated ketones and isocyanoacetate esters by synergistic silver/organocatalysis
作者:Pablo Martínez-Pardo、Gonzalo Blay、M. Carmen Muñoz、José R. Pedro、Amparo Sanz-Marco、Carlos Vila
DOI:10.1039/c8cc00856f
日期:——
acid has been applied in the reaction of unactivatedketones with tert-butyl isocyanoacetate to give chiral oxazolines bearing a quaternary stereocenter. The formal [3+2] cycloaddition provided high yields of the corresponding cis-oxazolines with good diastereoselectivity and excellent enantioselectivity, being applied to aryl–alkyl and alkyl–alkyl ketones.
Highly Diastereo- and Enantioselective Silver-Catalyzed Double [3+2] Cyclization of α-Imino Esters with Isocyanoacetate
作者:Pan-Lin Shao、Jia-Yu Liao、Yee Ann Ho、Yu Zhao
DOI:10.1002/anie.201402788
日期:2014.5.19
Presented herein is a new complexity‐generating method in which both functionalities of α‐imino esters undergo stereoselective cyclization with isocyanoacetates to produce directly linked oxazole‐imidazolines, which can be transformed into highly functionalized α,β‐diamino esters and imidazolinium salts in high diastereo‐ and enantiopurity.
A series of α-isocyanoacrylic acid derivatives were prepared via the α-formylaminoacrylic acid derivatives, which were obtained by the reaction of isocyanoacetic acids and carbonyl compounds, in order to examine their antimicrobial activities. The structureactivity relationships are presented ; it was found that (Z)-α-isocyanoacrylic acid esters possessing halogeno phenyl or thienyl groups exhibited fairly strong antifungal activities. Of these, (Z)-methyl α-isocyano-β-(2-thienyl) acrylates (5s and 5u) showed the highest activity (1.56μg/ml MIC) against Tricophyton mentagrophytes.