Asymmetric Hydroazidation of Nitroalkenes Promoted by a Secondary Amine-Thiourea Catalyst
作者:Tiziana Bellavista、Sara Meninno、Alessandra Lattanzi、Giorgio Della Sala
DOI:10.1002/adsc.201500403
日期:2015.10.12
Chiral β-nitro azides are obtained by asymmetric addition of azides to nitroalkenes, with an enantioselectivity of up to 82% ee. The reaction, promoted by an easily accessible secondary amine-thiourea catalyst, is performed with azidotrimethylsilane in the presence of benzoic acid. Products with different aliphatic β-substituents are obtained in good yields and with the highest enantioselectivity reported
手性β-硝基叠氮化物是通过将叠氮化物不对称加成到硝基烯烃中而获得的,其对映体选择性高达ee的82%。由易获得的仲胺-硫脲催化剂促进的反应是在苯甲酸存在下与叠氮三甲基硅烷进行的。获得具有不同脂肪族β-取代基的产品,收率高,迄今为止报道的对映选择性最高。发现仲胺基的存在对于实现高度立体控制至关重要。