α-L-diarylprolinol as the organocatalyst and K2CO3 as the additive has been accomplished. The spirocyclopropanes were isolated in high yield and up to 85 % ee. Notably, the asymmetric one-pot sequential approach to spirocyclopropanes proved to be a feasible process.
Synthesis of Activated Cyclopropanes by MHIRC Strategy: A Facile and Efficient Approach to Spirocyclopropanes Using N-Halosulfonamides
作者:Ramin Ghorbani-Vaghei、Yaser Maghbooli
DOI:10.1055/s-0035-1561653
日期:——
the preparation of spirodicyanocyclopropylindanediones from indane-1,3-dione and 2-arylidenemalononitriles is reported. These reactions involve Michael addition, halogenation, and intramolecular ring-closing (MHIRC) reaction sequences. In this study, a one-pot, three-component reaction of two molecules of indane-1,3-dione with aromaticaldehydes for the synthesis of spirocyclopropylindanediones using
One‐pot, fast cyclopropanation reaction of indandione with various aldehydes in the presence of cyanogen bromide and trimethylamine
作者:Michael Aalinejad、Nader Noroozi Pesyan
DOI:10.1002/jccs.201800419
日期:2019.11
A new, fast, and easy one‐pot cyclopropanation reaction of aromatic and aliphatic aldehydes with 1H‐indene‐1,3(2H)‐dione and cyanogen bromide (BrCN) was developed for synthesizing 3′‐(aryl[alkyl])‐dispiro[indan‐2,1′‐cyclopropane‐2′,2′′‐indan]‐1,1′′,3,3′′‐tetrone in excellent yields in a short time (about 15 s) under basic media. All structures were characterized using IR, 1H NMR, and 13C NMR spectroscopy
芳香族和脂肪族醛与1 H-茚-1,3(2 H)-二酮和溴化氰(BrCN)的一种新的,快速且简单的单锅环丙烷化反应被开发出来,用于合成3'-(芳基[烷基] )-双螺[[indan-2,1'-cyclopropane-2',2''-indan] -1,1'',3,3''tetrone在碱性条件下短时间内(约15 s)表现出优异的产量媒体。使用IR,1 H NMR和13 C NMR光谱技术表征所有结构。
Selective Formation of Spiro Dihydrofurans and Cyclopropanes Through Unexpected Reaction of Aldehydes with 1,3-Dicarbonyl Compounds
作者:Guan-Wu Wang、Jie Gao
DOI:10.1021/ol900451d
日期:2009.6.4
5-dimethylcyclohexane-1,3-dione and 1,3-indandione to selectively afford spirodihydrofuran and cyclopropane derivatives, promoted by molecular iodine and dimethylaminopyridine under mechanical milling conditions, has been demonstrated. The products were obtained in good to excellent yields. A possible mechanism of this unusual reaction process is proposed.