Direct Synthesis of Highly Substituted Pyrroles and Dihydropyrroles Using Linear Selective Hydroacylation Reactions
作者:Manjeet K. Majhail、Paul M. Ylioja、Michael C. Willis
DOI:10.1002/chem.201600311
日期:2016.6.1
diphosphine ligands, such as (Cy2 P)2 NMe or bis(diphenylphosphino)methane (dppm), are effective at catalysing the union of aldehydes and propargylic amines to deliver the linear hydroacylation adducts in good yields and with high selectivities. In situ treatment of the hydroacylation adducts with p-TSA triggers a dehydrative cyclisation to provide the corresponding pyrroles. The use of allylic amines, in place
cathode and an Mg rod anode under atmospheric pressure of bubbling carbondioxide through the solution under constant current conditions resulted in a reductive C–S bond cleavage with elimination of benzenesulfinate ion generating the corresponding anion species followed by fixation of carbondioxide to give the corresponding N-Boc-α-amino acids in moderate to good yields.
Synthesis of β-Allenylamines by Addition of Chloroprene Grignards to <i>N</i>-Boc Imines
作者:Arne G. A. Geissler、Bernhard Breit
DOI:10.1021/acs.orglett.2c03105
日期:2022.11.4
The γ-selective addition of chloroprene Grignards to aromatic N-Boc aldimines enabled by 2,2′-dimorpholinodiethyl ether (DMDEE) yields the corresponding N-Boc protected β-allenylamines in good yields and regioselectivities. Transmetalation to zinc bromide also allows the addition of chloroprene Grignard to aliphatic aldimines in good yields. The obtained β-allenylamines were shown to be easily deprotected
Direct Organocatalytic Asymmetric para C–H Aminoalkylation of Aniline Derivatives Affording Diarylmethylamines
作者:Cheng-Long Wang、Yong-Ling Li、Tong-Mei Ding、Zhen-Liang Sun、Le Wang、Xun-Hui Wang、Jia Zhou、He-Yuan Bai
DOI:10.1055/a-2122-3731
日期:2023.11
aminoalkylation of aniline derivatives to prepare chiral diarylmethylamine system was developed. Aniline derivatives underwent an enantioselective aminoalkylation in the presence of chiral phosphoric acid, affording a series of opticallyactive diarylmethylamine products in good yields and enantioselectivities (73% yield, 91% ee). Furthermore, this method could be used to prepare the key intermediate of