Interrupted Nazarov Reactions Using Dichlorocyclopropanes: A Novel Mode of Arene Trapping
摘要:
2-Siloxy-2-alkenyl-1,1-dichlorocyclopropanes with aryl-terminated side chains undergo silver-assisted electrocyclic opening/Nazarov cyclization. The resulting 2-siloxycyclopentenyl cations are intercepted by the pendant arenes to furnish tricyclic adducts in moderate to good yields. In cases where the arene trap was tethered through the cyclopropane unit, a new mode of trapping occurred to generate unique bridged carbon frameworks.
Formal asymmetric enone aminohydroxylation: organocatalytic one-pot synthesis of 4,5-disubstituted oxazolidinones
作者:David Cruz Cruz、Pedro A. Sánchez-Murcia、Karl Anker Jørgensen
DOI:10.1039/c2cc32385k
日期:——
A formal asymmetricorganocatalytic aminohydroxylation reaction of enones has been achieved via an aziridination-double S(N)2 sequence. As a part of the reaction design, the generated amino alcohol products are isolated as the corresponding oxazolidinones in good yields and excellent stereoselectivities.
Interrupted Nazarov Reactions Using Dichlorocyclopropanes: A Novel Mode of Arene Trapping
作者:Tina N. Grant、F. G. West
DOI:10.1021/ol7015669
日期:2007.9.1
2-Siloxy-2-alkenyl-1,1-dichlorocyclopropanes with aryl-terminated side chains undergo silver-assisted electrocyclic opening/Nazarov cyclization. The resulting 2-siloxycyclopentenyl cations are intercepted by the pendant arenes to furnish tricyclic adducts in moderate to good yields. In cases where the arene trap was tethered through the cyclopropane unit, a new mode of trapping occurred to generate unique bridged carbon frameworks.