Catalytic Asymmetric Aldol-Type Reaction of Zinc Enolate Equivalent of Amides
作者:Ryosuke Haraguchi、Seijiro Matsubara
DOI:10.1021/ol401425s
日期:2013.7.5
Treatment of phenyl isocyanate with bis(iodozincio)methane gave a zinciomethylenated product, which acts as an amide-enoate equivalent. It did not react with an aldehyde efficiently, but gave the corresponding adduct in good yield in the presence of an aminoalcohol. Use of a catalytic amount of chiral aminoalcohol led the process to the catalytic asymmetric Aldol-type reaction.
Preparation of the Zinc Enolate Equivalent of Amides by Zinciomethylation of Isocyanates: Catalytic Asymmetric Reformatsky-Type Reaction
作者:Seijiro Matsubara、Ryosuke Haraguchi
DOI:10.1055/s-0034-1378514
日期:——
an activator, leads to a catalytic asymmetric Reformatsky-type reaction. Bis(iodozincio)methane [CH2(ZnI)2] transforms isocyanates (R–N=C=O) into the enolate equivalent of amides via zinciomethylation. The reactivity of the enolate equivalent as a nucleophile toward aldehydes depends on the R group of the isocyanate. For the enolate equivalent formed from phenyl isocyanate, the addition of a catalytic
摘要 双(碘并甲烷)甲烷[CH 2(ZnI)2 ]通过锌甲基化将异氰酸酯(RN = C = O)转化为酰胺的烯醇式当量。作为亲核体的烯醇化物等效物对醛的反应性取决于异氰酸酯的R基团。对于由异氰酸苯酯形成的烯醇盐当量,加入催化量的光学活性氨基醇(作为活化剂)会导致催化不对称的Reformatsky型反应。 双(碘并甲烷)甲烷[CH 2(ZnI)2 ]通过锌甲基化将异氰酸酯(RN = C = O)转化为酰胺的烯醇式当量。作为亲核体的烯醇化物等效物对醛的反应性取决于异氰酸酯的R基团。对于由异氰酸苯酯形成的烯醇盐当量,加入催化量的光学活性氨基醇(作为活化剂)会导致催化不对称的Reformatsky型反应。