作者:Yi An Cheng、Wesley Zongrong Yu、Ying-Yeung Yeung
DOI:10.1002/anie.201504724
日期:2015.10.5
A highly facile, efficient, and enantioselectivebromolactamization of olefinic amides was effected by a carbamate catalyst and ethanol additive. The amide substrates underwent N‐cyclization predominantly to give a diverse range of enantioenriched bromolactam products containing up to two stereogenic centers.
Catalytic Enantioselective Iodoetherification of Oximes
作者:Chandra Bhushan Tripathi、Santanu Mukherjee
DOI:10.1002/anie.201304173
日期:2013.8.5
The first catalyticenantioselectiveiodoetherification of oximes is developed using commercially available N‐iodosuccinimide. In the presence of a dihydrocinchonidine‐derived thiourea (10 mol %), β,γ‐unsaturated oximes undergo facile iodoetherification to produce Δ2‐isoxazolines containing a quaternary stereogenic center generally in high yield with good to excellent enantioselectivity.