Hydrogen transfer and C–H activation in a dihydroiridium amido-alkene complex
作者:John M. Brown、Peter J. Maddox
DOI:10.1039/c39870001278
日期:——
Dihydrogen addition to the alkene complex (5) is regiospecific and stereoselective; the dihydride mixture is converted into alkyl hydrides and ultimately into a chelation-controlled C–H insertion product (10).
The intermolecular Heck arylations of the cyclopentenyl based spirolactams 6a and 6c are stereoselective leading to adducts 7 and 8 derived by face-selective carbopalladation anti to the lactam carbonyl.
Non-Covalent Carbonyl-Directed Heck-Matsuda Desymmetrizations: Synthesis of Cyclopentene-Fused Spirooxindoles, Spirolactones, and Spirolactams
作者:Shivashankar Kattela、Gabriel Heerdt、Carlos R. D. Correia
DOI:10.1002/adsc.201600946
日期:2017.1.19
Enantioselective carbonyl‐directable Heck reactions using aryldiazonium salts were developed with the aim to construct chiral quaternary spiro centers in an efficient manner. Five‐ and six‐membered spirooxindoles, spirolactones, and spirolactams (36 examples) were obtained in good to excellent isolated yields with diastereoselectivities ranging from 13:1 to >20:1, and enantiomeric excesses up to 99%