252248-89-8Relevant academic research and scientific papers
α,β-Unsaturated N-Acylindoles: An Alternative Class of Michael Acceptors and Their Application in Asymmetric Borylation
Jiang, Quanbin,Guo, Tenglong,Gao, Runli,Wang, Quannan,Lou, Jiang,Yu, Zhengkun
, p. 7981 - 7993 (2018/06/04)
Copper(I)-catalyzed enantioselective borylation of α,β-unsaturated N-acylindoles as well as N-acylpyrroles was efficiently achieved by means of bis(pinacolato)diboron (B2pin2), affording the enantioenriched products in excellent yields with up to 99% ee. The present work provides an alternative class of Michael acceptors, that is, α,β-unsaturated N-acylindoles, for potential asymmetric transformations.
Bifunctional Thiourea-Catalyzed Stereoablative Retro-Sulfa-Michael Reaction: Concise and Diastereoselective Access to Chiral 2,4-Diarylthietanes
Bacsó, András,Szigeti, Mariann,Varga, Szilárd,Soós, Tibor
, p. 429 - 439 (2016/12/24)
Owing to the chiral recognition capacity of bifunctional thioureas, a stereoablative retro-sulfa-Michael reaction has been developed. Utilization of a biphasic system enabled us to render the process catalytic. The usefulness of this methodology was further illustrated by the diastereoselective synthesis of all possible stereoisomers of 2,4-diarylthiethanes.
A practical preparation of highly versatile N-acylpyrroles from 2,4,4-trimethoxybutan-1-amine
Maehara, Tomoaki,Kanno, Rentaro,Yokoshima, Satoshi,Fukuyama, Tohru
supporting information; experimental part, p. 1946 - 1948 (2012/06/01)
A novel method for the preparation of N-acylpyrrole is described. The method involves condensation of carboxylic acids with 2,4,4-trimethoxybutan-1- amine, followed by acid-mediated cyclization to form the pyrrole ring. The preparative procedure is highly
Palladium-catalyzed conjugate allylation reactions of α,β- unsaturated N- acylpyrroles
Shaghafi, Michael B.,Kohn, Benjamin L.,Jarvo, Elizabeth R.
supporting information; experimental part, p. 4743 - 4746 (2009/05/31)
(Chemical Equation Presented) Conjugate allylation reactions of α,β-unsaturated N-acylpyrroles using allylboronic ester are catalyzed by a palladium complex that is ligated by a bidentate N-heterocyclic carbene. A variety of functional groups are tolerate
Catalytic asymmetric epoxidation of α,β-unsaturated N-acylpyrroles as monodentate and activated ester equivalent acceptors
Matsunaga, Shigeki,Qin, Hongbo,Sugita, Mari,Okada, Shigemitsu,Kinoshita, Tomofumi,Yamagiwa, Noriyuki,Shibasaki, Masakatsu
, p. 6630 - 6639 (2007/10/03)
Catalytic asymmetric epoxidation of α,β-unsaturated N-acylpyrroles as monodentate and activated ester equivalent acceptors is described. A Sm(O-i-Pr)3/(R)-H8-BINOL complex promoted the epoxidation reaction to afford products in high yield (up to quant) and high enantiomeric excess (up to >99.5% ee). Reaction proceeded smoothly using cumene hydroperoxide (CMHP) with low explosive hazard, and completed within 0.2-0.5 h with 5 mol % catalyst. Catalyst loading was successfully reduced to as little as 0.02 mol %. The N-acylpyrrole properties as well as efficient synthesis of α,β-unsaturated N-acylpyrroles are also described.
Sequential Wittig olefination-catalytic asymmetric epoxidation with reuse of waste Ph3P(O): Application of α,β-unsaturated N-Acyl pyrroles as ester surrogates
Kinoshita, Tomofumi,Okada, Shigemitsu,Park, Sun-Ryung,Matsunaga, Shigeki,Shibasaki, Masakatsu
, p. 4680 - 4684 (2007/10/03)
Waste not, want not: Efficient one-pot access to optically active epoxides with 96 to 99.5% ee from a variety of aldehydes is described. In a sequential process, the Ph3P(O) by-product of a Wittig reaction acts as a modulator for the samarium catalyst in the asymmetric epoxidation of the conjugated N-acyl pyrrole Wittig product (see scheme). The N-acyl pyrrole functionality is key to the high reactivity and selectivity observed. R = alkyl, aryl, vinyl.
Remarkably stable tetrahedral intermediates: Carbinols from nucleophilic additions to N-acylpyrroles
Evans, David A.,Borg, George,Scheidt, Karl A.
, p. 3188 - 3191 (2007/10/03)
Sufficiently stable intermediates formed in the reaction of N-acylpyrroles (1) with hydride and Grignard reagents can undergo further synthetic transformations and chromatographic purification to enable the generation of pyrrolecarbinols 2 in 76-95% yields [Eq. (1)].
