Multistep Organocatalysis for the Asymmetric Synthesis of Multisubstituted Aldehydes from Allylic Alcohols
作者:Xuan-Huong Ho、Hyun-Ji Oh、Hye-Young Jang
DOI:10.1002/ejoc.201200863
日期:2012.10
chiral amine organocatalyst induces the formation of multifunctionalized aldehydesfrom aromatic and aliphatic allylicalcohols. Reactions occur with excellent levels of enantioselectivity, under environmentally benign conditions, and without involving stoichiometric amounts of chemical oxidants for the oxidation of the allylicalcohols or rigorous reaction conditions for transition-metal catalysis.
Tandem Iminium/Copper Catalysis: Highly Enantioselective Synthesis of α,β-Disubstituted Aldehydes
作者:Ju-Hye Kim、Eun-Jin Park、Hwa-Jung Lee、Xuan-Huong Ho、Hyo-Sang Yoon、Pilsoo Kim、Hoseop Yun、Hye-Young Jang
DOI:10.1002/ejoc.201300333
日期:2013.7
iminium/copper catalysis allowed highly optically active α,β-disubstituted aldehydes to be synthesized with good yields in one-pot fashion. The β-substitution took place through iminium-catalyzed Michael addition of nitromethane or diethyl malonate to the α,β-unsaturated aldehydes, followed by copper-assisted addition of TEMPO (2,2,6,6-tetramethylpiperidin-1-yloxyl) at the aldehyde α-position. An
为了在环境友好和经济的条件下合成具有生物和合成价值的产品,不对称有机催化反应与铜催化反应相结合。这种亚胺/铜催化允许以一锅法以良好的收率合成高光学活性的 α,β-二取代醛。β-取代是通过亚胺催化硝基甲烷或丙二酸二乙酯与 α,β-不饱和醛的迈克尔加成,然后在铜辅助下加入 TEMPO(2,2,6,6-四甲基哌啶-1-yloxyl)醛的α位。亚胺/铜催化的串联加成产物转化为 3,4,5-三取代哌啶,用于 X 射线晶体学分析。
β-치환 광학 활성 카르보닐 화합물의 합성방법
申请人:AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION 아주대학교산학협력단(220040257423) BRN ▼124-82-14602
公开号:KR20150006394A
公开(公告)日:2015-01-16
본 발명은 하기의 화학식 1-1의 α, β- 치환 광학 활성 카르보닐 화합물, 하기의 화학식 4-1로 표현되는 β- 치환 광학 활성 카르보닐 화합물 등을 획기적으로 합성하는 방법을 제공한다. 즉, 알릴릭 알코올(allylic alcohol)을 출발물질로 하여 연속적인 산화반응, 마이클 부가반응, 선택적인 α-옥시아민반응(α-oxyaminaion)을 통해 마일드한 조건에서 광학 활성 카르보닐 화합물을 합성하는 방법을 제공한다. <화학식 1-1> <화학식 4-1>
N719 Dye-Sensitized Organophotocatalysis: Enantioselective Tandem Michael Addition/Oxyamination of Aldehydes
作者:Hyo-Sang Yoon、Xuan-Huong Ho、Jiyeon Jang、Hwa-Jung Lee、Seung-Joo Kim、Hye-Young Jang
DOI:10.1021/ol3011858
日期:2012.7.6
A remarkably efficient photosensitizer, N719 dye, was used in asymmetric tandem Michael addition/oxyamination of aldehydes, rendering alpha,beta-substituted aldehydes in good yields with excellent levels of enantioselectivity and diastereoselectivity. This is the first report of a multiorganocatalytic reaction involving iminium catalysis and photoinduced singly occupied molecular orbital (SOMO) catalysis. This reaction is expected to expand the scope of tandem organocatalytic reactions.