Cyclic Aldimines as Superior Electrophiles for Cu-Catalyzed Decarboxylative Mannich Reaction of β-Ketoacids with a Broad Scope and High Enantioselectivity
作者:Heng-Xia Zhang、Jing Nie、Hua Cai、Jun-An Ma
DOI:10.1021/ol500929d
日期:2014.5.2
enantioselective decarboxylativeMannichreaction of cyclic aldimines with β-ketoacids is described. The cyclic structure of these aldimines, in which the C═N bond is constrained in the Z geometry, appears to be important, allowing Mannich condensation to proceed in high yields with excellent enantioselectivities. A chiral chroman-4-amine was synthesized from the decarboxylativeMannich product in several
Asymmetric organocatalytic decarboxylative Mannich reaction using β-keto acids: A new protocol for the synthesis of chiral β-amino ketones
作者:Chunhui Jiang、Fangrui Zhong、Yixin Lu
DOI:10.3762/bjoc.8.144
日期:——
The first decarboxylativeMannichreaction employing beta-keto acids, catalyzed by cinchonine-derived bifunctional thiourea catalyst has been described. The desired beta-amino ketones were obtained in excellent yields and with moderate to good enantioselectivities.
Asymmetric Synthesis of Acyclic 1,3-Amino Alcohols by Reduction of <i>N</i>-Sulfinyl β-Amino Ketones. Formal Synthesis of (−)-Pinidinol and (+)- Epipinidinol
作者:Franklin A. Davis、Paul M. Gaspari、Brad M. Nolt、Peng Xu
DOI:10.1021/jo801653c
日期:2008.12.19
Stereoselective reduction of acyclic N-sulfinyl beta-amino ketones with (LiEt(3)BH) and Li(t-BuO)(3)AlH, respectively, gave anti- and syn-1,3-amino alcohols with excellent selectivity. A formal asymmetric synthesis of the hydroxy piperidine alkaloids (-)-pinidinol and (+)-epipinidinol from a common N-sulfinyl beta-amino ketone ketal precursor was developed. The pinidinol piperidine ring was formed