AbstractVisible light‐mediated decarboxylation using N‐acyloxyphthalimides as the source for carbon‐centered radicals was applied for the synthesis of spirobutenolides. The utility of this approach is demonstrated with the formal synthesis of (S)‐(+)‐lycoperdic acid. Alternatively, 2,3‐anellated furans can be obtained in a one‐pot procedure via photocyclization following a regioselective semipinacol rearrangement.magnified image
Effect of pressure on sterically hindered reactions with late transition states
作者:Badra Gacem、Gérard Jenner
DOI:10.1002/poc.718
日期:2004.3
The effect of high pressure is examined in two types of sterically congested reactions presenting late transitionstates: isopolar Diels–Alder cycloadditions of isoprene and quinones of various steric environment and conjugate additions of tert-butylamine and acrylic compounds. In the Diels–Alder cycloadditions, pressure has no enhanced kinetic sensitivity in sterically demanding reactions compared
Nickel‐Catalyzed Cascade Cyclization‐Negishi Coupling of Redox Active Esters for the Synthesis of Pyrrolidines
作者:Juan Carlos Nieto‐Carmona、Raúl San Román、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/ejoc.202200992
日期:2022.11.25
Exploiting nickel radical behaviour: powerful consecutive formation of two C−C bonds, including a ring-closing reaction, allows the preparation of functionalized pyrrolidines in a single synthetic operation which also avoids the use of halogen-containing electrophiles.
AbstractVisible light‐mediated decarboxylation using N‐acyloxyphthalimides as the source for carbon‐centered radicals was applied for the synthesis of spirobutenolides. The utility of this approach is demonstrated with the formal synthesis of (S)‐(+)‐lycoperdic acid. Alternatively, 2,3‐anellated furans can be obtained in a one‐pot procedure via photocyclization following a regioselective semipinacol rearrangement.magnified image
Catalytic high pressure synthesis of hindered β-aminoesters
作者:Gérard Jenner
DOI:10.1016/0040-4039(94)02215-w
日期:1995.1
Hindered β-aminoesters are obtained in fair to high yields by the conjugate addition of amines to α,β-unsaturated esters, both substrates harbouring bulky groups, under highpressure in the presence of catalytic amounts of ytterbium triflate.