当前位置: X-MOL 学术Org. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Copper(II) Acetate-Induced Oxidation of Hydrazones to Diazo Compounds under Flow Conditions Followed by Dirhodium-Catalyzed Enantioselective Cyclopropanation Reactions
Organic Letters ( IF 4.9 ) Pub Date : 2021-07-06 , DOI: 10.1021/acs.orglett.1c01580
Bo Wei 1 , Taylor A Hatridge 2 , Christopher W Jones 2 , Huw M L Davies 1
Affiliation  

A tandem system comprising in-line diazo compound synthesis and downstream consumption in a rhodium-catalyzed cyclopropanation reaction has been developed. Passing hydrazone through a silica column absorbed with Cu(OAc)2-H2O/N,N-dimethylaminopyridine oxidized the hydrazone to generate an aryldiazoacetate in flow. The crude aryldiazoacetate elutes from this column directly into a downstream cyclopropanation reaction, catalyzed by the chiral dirhodium tetracarboxylates, Rh2(R-p-Ph-TPCP)4 and Rh2(R-PTAD)4. This convenient flow to batch method was applied to the synthesis of a range of 1,2-diarylcyclopropane-1-carboxylates in high yields and with high levels of enantioselectivity.

中文翻译:

在流动条件下,乙酸铜 (II) 诱导腙氧化为重氮化合物,然后是铑催化的对映选择性环丙烷化反应

已经开发了一种串联系统,该系统包括在线重氮化合物合成和铑催化环丙烷化反应的下游消耗。使腙通过吸附有Cu(OAc) 2 -H 2 O/ N的二氧化硅柱,N-二甲氨基吡啶氧化腙以生成流动的重氮乙酸芳基酯。粗重氮基乙酸酯从该柱中直接洗脱到下游环丙烷化反应中,由手性四羧酸铑、Rh 2 ( R - p -Ph-TPCP) 4和 Rh 2 ( R -PTAD) 4催化. 这种方便的分批流方法适用于以高产率和高对映选择性合成一系列 1,2-二芳基环丙烷-1-羧酸酯。
更新日期:2021-07-16
down
wechat
bug