Dirhodium(II) Carboxylate Catalyzed Formation of 1,2,3-Trisubstituted Indoles from Styryl Azides
作者:Crystalann Jones、Quyen Nguyen、Tom G. Driver
DOI:10.1002/anie.201308611
日期:2014.1.13
Dirhodium(II)‐carboxylate complexes were discovered to promote the selective migration of acyl groups in trisubstituted styryl azides to form 1,2,3‐trisubstituted indoles. The styryl azides are readily available in three steps from cyclobutanone and 2‐iodoaniline.
Dual Directing-Groups-Assisted Redox-Neutral Annulation and Ring Opening of <i>N</i>-Aryloxyacetamides with 1-Alkynylcyclobutanols via Rhodium(III)-Catalyzed C–H/C–C Activations
A cascade [3 + 2] annulation and ringopening of N-aryloxyacetamides with 1-alkynylcyclobutanols via Rh(III)-catalyzed redox-neutral C–H/C–C activations using internal oxidative O–NHAc and −OH as the dual directing groups has been achieved. This reaction provided an efficient and regioselective approach to benzofuran derivatives with good functional group compatibility and high yields.
through a hydrazine-directed C–H functionalization pathway. This [4+1] annulation, based on the cleavage of a Csp–Csp triple bond in alkynylcyclobutanol, provides a new pathway to prepare diverse 1H-indazoles under mild reaction conditions.
Palladium-catalyzed ring expansion reaction of 1-alkynylcyclobutanols with aryl iodides: an efficient route to 2-disubstituted methylenecyclopentanones
作者:Li-Mei Wei、Li-Lan Wei、Wen-Bin Pan、Ming-Jung Wu
DOI:10.1016/s0040-4039(02)02581-9
日期:2003.1
The reaction of 1-alkynylcyclobutanols with aryl iodides in the presence of Pd(OAc)2 and Et3N in acetonitrile at 80°C for 24 h gives 2-disubstituted methylenecyclopentan-1-ones in modest to good yields. The tandem insertion-ring expansion process proceeds via the formation of an alkynyl π-complex, followed by migration of a carbon-carbon bond of the tert-alkanol to form the cyclopentanones stereoselectively
Selective Synthesis of Pyrazolo[1,2-<i>a</i>]pyrazolones and 2-Acylindoles via Rh(III)-Catalyzed Tunable Redox-Neutral Coupling of 1-Phenylpyrazolidinones with Alkynyl Cyclobutanols
作者:Yuanshuang Xu、Mengyang Shen、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.0c01475
日期:2020.6.19
An unprecedented divergent synthesis of pyrazolo[1,2-a]pyrazolones and 2-acylindoles via Rh(III)-catalyzed [4 + 1] or [3 + 2] annulation of 1-phenylpyrazolidinones with alkynyl cyclobutanols through redox-neutral multiple bond activation by using −NH and −OH units as directing groups is presented. Notably, different annulation reactions were selectively achieved by simply adjusting the reaction conditions
通过Rh(III)催化1-苯基吡唑烷二酮与炔基环丁醇通过氧化还原-中性多键的环化反应,空前地合成吡唑并[1,2- a ]吡唑并酮和2-酰基吲哚。提出了通过使用-NH和-OH单元作为导向基团的活化。值得注意的是,通过简单地调节反应条件选择性地实现了不同的环化反应。这些方法具有操作简单,容易获得的底物和高区域选择性/化学选择性等特点,可以在相关领域广泛应用。