importance. An attractive strategy is the arylation of imines with organoboronreagents. Chiral Rh complexes have reached a high level of productivity for this reaction type. In this article we describe that an electron rich PdII catalyst also performs well in the arylation of aldimines, comparable to the best Rh catalysts. The ferrocenyl palladacycle‐acetate catalyst allows for a broad substrate scope and
Phosphane-Catalyzed [4+2] Annulation of Allenoates with Ketimines: Synthesis of Sultam-Fused Tetrahydropyridines
作者:Xiang-Yu Chen、Song Ye
DOI:10.1002/ejoc.201200747
日期:2012.10
Cyclic ketimines were successfully used as electrophiles in phosphane-catalyzed [4+2] annulation reactions with ethyl 2-methyl-2,3-butadienoate to give the corresponding highly substituted tetrahydropyridine derivatives in moderate to good yields (55–73 %), and with moderate to excellent regioselectivity.
Catalytic [2+2] and [3+2] cycloaddition reactions of allenoates with cyclic ketimines
作者:Xiang-Yu Chen、Ruo-Chen Lin、Song Ye
DOI:10.1039/c2cc16055b
日期:——
Cyclic ketimines as electrophiles for [2+2] and [3+2] cycloaddition reactions of allenoates have been developed, affording functionalized sultam-fused azetidines and dihydropyrroles, respectively, in good yields with high regioselectivities.
A metal‐free method for reduction of cyclic N‐sulfonyl ketimines catalyzed by B(C6F5)3, using commercially available methylphenylsilane as a reducing reagent under mild conditions has been developed. This reductive method was effective, not only providing the expected cyclic N‐Sulfonamides in good to excellent yields, but also showing good functional‐group tolerance.
开发了一种无金属的方法,在温和的条件下,使用市售的甲基苯基硅烷作为还原剂,还原由B(C 6 F 5)3催化的环状N-磺酰基酮亚胺。这种还原方法是有效的,不仅可以提供预期的环状N-磺酰胺类化合物,而且产率很高,而且显示出良好的官能团耐受性。