作者:Celine Poulard、Julien Cornet、Stephanie Legoupy、Gilles Dujardin、Robert Dhal、Francois Huet
DOI:10.2174/157017809788681338
日期:2009.7.1
Cross coupling metathesis reactions from two ethylenic compounds 4 and 5 easily led to Michael acceptors 6ab and 7a-b. Reaction of these compounds, or of enone 5, with p-toluenesulfonylmethyl isocyanide (TosMIC) provided the disubstituted pyrroles 9a-c and 10a-b. The analogous reaction of compounds 6a-b and 5, but in presence of Ph3SnCl, provided the trisubstituted pyrroles 11a-c. All of these compounds 9-11 were thus obtained in two steps only.
ALBEROLA, ANGEL;ANDRES, JOSE M.;GONZALEZ, ALFONSO;PEDROSA, RAFAEL;VICENTE+, J. CHEM. SOC. PERKIN TRANS. PT 1,(1990) N0, C. 2681-2685
作者:ALBEROLA, ANGEL、ANDRES, JOSE M.、GONZALEZ, ALFONSO、PEDROSA, RAFAEL、VICENTE+
DOI:——
日期:——
Differential reactivity of β-amino enones and 3-dimethylaminoacrylaldehyde towards α-amino derivatives
作者:Angel Alberola、José M. Andrés、Alfonso González、Rafael Pedrosa、Martina Vicente
DOI:10.1039/p19900002681
日期:——
Unsubstituted β-aminoenones react with α-aminoderivatives by a well established route which implies a fast transamination process — 1,4-addition followed by elimination — and cyclodehydration of the intermediate to 3-functionalized pyrroles. In contrast, 3-dimethylaminoacrylaldehyde undergoes 1,2-addition followed by cyclization to give the final 2-substituted pyrroles. Isolation of the intermediates
developed to access axially chiral 2-arylpyrroles using catalytic asymmetric Suzuki–Miyaura cross-coupling. A wide range of axially chiral arylpyrroles were obtained in high yields with good to excellent enantioselectivities. The key to success is the use of a combined catalytic system involving a palladium catalyst and chiral ferrocene diphosphine ligand for achieving effective enantiocontrol. More importantly