Diastereoselective Synthesis of β-Substituted-α,γ-Diaminobutyric Acids and Pyrrolidines Containing Multichiral Centers
作者:Yan Huang、Qiong Li、Tian-Liang Liu、Peng-Fei Xu
DOI:10.1021/jo8023076
日期:2009.2.6
Configuration of the second new stereocenter was decided by the substitution of nitroalkene. Selective reduction and hydrolysis of the Michael adducts furnished the desired β-substituted-α,γ-diaminobutyricacids in good yields and high enantiomeric excesses (>99% ee). Synthesis of pyrrolidines containing multichiral centers has also been accomplished in good to excellent yields and diastereoselectivities
Enantiodivergent Synthesis of Bis-Spiropyrrolidines via Sequential Interrupted and Completed (3 + 2) Cycloadditions
作者:Egoitz Conde、Iván Rivilla、Amaia Larumbe、Fernando P. Cossío
DOI:10.1021/acs.joc.5b01418
日期:2015.12.4
hydrogenation of the nitro group followed by in situ cyclization. Imines derivedfrom these latter compounds are the precursors of N-metalated azomethineylidesfrom which up to four new chiral centers can be generated via completed (3 + 2) cycloaddition reactions with full regio- and diastereocontrol. Cis- and trans-γ-lactams lead to opposite bis-spiropyrrolidine enantiomers. Therefore, both enantiomeric series