Enantioselective Conjugate Addition of Donor–Acceptor Hydrazones to α,β-Unsaturated Aldehydes through Formal Diaza–Ene Reaction: Access to 1,4-Dicarbonyl Compounds
作者:Maitane Fernández、Uxue Uria、Jose L. Vicario、Efraím Reyes、Luisa Carrillo
DOI:10.1021/ja3041042
日期:2012.7.25
Donor-acceptor monosubstituted hydrazones participate as suitable reagents able to undergo an enantioselective formal diaza-ene reaction with α,β-unsaturated aldehydes under chiral secondary amine catalysis. This constitutes a new approach for the enantioselective conjugate addition of hydrazones to enals under metal-free conditions and leads to the formation of γ-hydrazono carboxylic acids after oxidation/[1
供体-受体单取代腙作为合适的试剂参与,能够在手性仲胺催化下与α,β-不饱和醛进行对映选择性的二氮杂烯反应。这构成了在无金属条件下腙与烯醛的对映选择性共轭加成的新方法,并导致在氧化/[1,3]-H 转移后形成 γ-腙羧酸。该方法还可用于通过使用腙部分作为掩蔽羰基来合成富含对映体的 β-取代的 α-酮-1,5-二酯。