Bisphosphine-Triggered One-Pot Sequential [3 + 2]/[3 + 2] Annulation of Allenoates with Cyclic Ketimines
作者:Li-Jun Yang、Shuai Wang、Jing Nie、Shen Li、Jun-An Ma
DOI:10.1021/ol402364t
日期:2013.10.18
bisphosphine-triggered one-potsequential [3 + 2]/[3 + 2] annulation of allenoates with cyclic ketimines was developed, in which the product of the first [3 + 2] annulation is the electron-deficient substrate for the second [3 + 2] annulation reaction. The reaction is exceptionally regioselective and diastereoselective. This novel and highly convergent strategy may open up a new viewpoint in utilizing allenoates to prepare
A Highly Regio- and Diastereoselective Phosphane-Catalyzed [3+2] Annulation of Morita-Baylis-Hillman Carbonates with Cyclic<i>N</i>-Acyl Ketimines
作者:Li-Jun Yang、Hua Cai、Jing Nie、Jun-An Ma
DOI:10.1002/ejoc.201300342
日期:2013.7
A highlyregio- and diastereoselectivephosphane-catalyzed [3+2] annulation of Morita–Baylis–Hillman (MBH) carbonates with cyclic N-acyl-substituted ketimines was developed. In the presence of the catalyst PBu3 (10 mol-%), a series of N-fused tricyclic products were obtained in excellent yields and diastereoselectivities under mild conditions. An example of a catalytic enantioselective annulation is
Highly enantioselective organocatalytic Strecker reaction of cyclic N-acyl trifluoromethylketimines: synthesis of anti-HIV drug DPC 083
作者:Fa-Guang Zhang、Xiao-Yan Zhu、Shen Li、Jing Nie、Jun-An Ma
DOI:10.1039/c2cc36307k
日期:——
A highly efficient, organocatalytic, enantioselective Strecker reaction of cyclic N-acyl ketimines was developed for the preparation of enantioenriched cyclic α-amino nitriles with a quaternary carbon stereocentre and anti-HIV drug DPC 083.
开发了环状 N-酰基酮亚胺的高效、有机催化、对映选择性 Strecker 反应,用于制备具有季碳立构中心的对映体富集的环状 α-氨基腈和抗 HIV 药物 DPC 083。
Chiral Phosphoric Acid-Catalyzed Asymmetric Aza-Friedel-Crafts Reaction of Indoles with Cyclic<i>N</i>-Acylketimines: Enantioselective Synthesis of Trifluoromethyldihydroquinazolines
作者:Ke-Feng Zhang、Jing Nie、Ran Guo、Yan Zheng、Jun-An Ma
DOI:10.1002/adsc.201300534
日期:2013.11.25
AbstractAn enantioselective aza‐Friedel–Crafts (F‐C) reaction of indoles with cyclic N‐acylketimines has been developed. By using chiral phosphoric acid catalysts, a wide range of enantioenriched trifluoromethyldihydroquinazolines was obtained in excellent yields (up to 98%) with good to high enantioselectivities (up to 99% ee).magnified image
Nucleophilic Lewis Base Dependent Addition Reactions of Allenoates with Trifluoromethylated Cyclic Ketimines
作者:Li-Jun Yang、Shen Li、Shuai Wang、Jing Nie、Jun-An Ma
DOI:10.1021/jo500356t
日期:2014.4.18
A detailed investigation on the different reactivity patterns shown by phosphorus- and nitrogen-containing Lewis base catalysts in the reactions of allenoates with cyclic trifluoromethyl ketimines was accomplished. With PPh3, [3 + 2] annulations proceeded smoothly to afford dihydropyrrole derivatives in excellent yields. Under the catalysis of DABCO, [2 + 2] annulations occurred, producing azetidine derivatives in good to high yields. However, in the presence of pyridine, alpha,alpha'-disubstituted allenoates were obtained in very high yields via aza-Morita-Baylis-Hillman reactions. These studies provide an opportunity for diverse synthesis of a variety of N-heterocyclic compounds from the same starting materials.