Enantioselective Copper-Catalyzed Conjugate Addition to 2- or 3-Substituted Cyclopent-2-en-1-ones: Construction of Stereogenic Quaternary Carbon Centers
Trimethyl- and triethylaluminum undergo enantioselectiveconjugateaddition to 2- and 3-substituted cyclopent-2-en-1- ones in the presence of catalytic amount of a copper salt and a phosphoramidite or a diphosphite ligand. Thus, chiral quaternarycenters can be built with up to 93% ee.
在催化量的铜盐和亚磷酰胺或二亚磷酸酯配体的存在下,三甲基铝和三乙基铝经历对映选择性共轭加成到 2-和 3-取代的环戊-2-en-1-。因此,可以用高达 93% 的 ee 构建手性四元中心。
Crouzet,J. et al., Bulletin de la Societe Chimique de France, 1967, p. 3722 - 3729
作者:Crouzet,J. et al.
DOI:——
日期:——
A new spiro-annelation procedure: intramolecular decarboxylative alkylation of β-keto-esters
作者:Robert G. Eilerman、Brian J. Willis
DOI:10.1039/c39810000030
日期:——
A newintramoleculardecarboxylativealkylation route to spirocyclic ketones, and its application to the synthesis of (±)-β-vetivone and (±)-β-vetispirene are described.