Chemoselective α-Sulfidation of Amides Using Sulfoxide Reagents
作者:Mario Leypold、Kyan A. D’Angelo、Mohammad Movassaghi
DOI:10.1021/acs.orglett.0c03160
日期:2020.11.20
The direct α-sulfidation of tertiary amidesusing sulfoxide reagents under electrophilic amide activation conditions is described. Employing convenient and readily available reagents, selective functionalization takes place to generate isolable sulfonium ions en route to α-sulfide amides. Mechanistic studies identified activated sulfoxides as promoters of the desired transformation and enabled the
General Synthesis of α-Alkyl Ynones from Morpholine Amides and 1-Copper(I) Alkynes Promoted by Triflic Anhydride
作者:Yunxiang Weng、Lin Min、Xiaobao Zeng、Lidong Shan、Xinyan Wang、Yuefei Hu
DOI:10.1021/acs.orglett.0c02944
日期:2020.11.6
The first general method for the synthesis of α-alkyl ynones was developed based on the strategy of electrophilic activation of amides. Its distinctive advantages are attributed to the use of air-stable “bare” 1-copper(I) alkyne as a mild nucleophile without any exogeneous ligand.
General Synthesis of Fully Substituted 4-Aminooxazoles from Amides and 1,4,2-Dioxazol-5-ones Based on Amide Activation and Umpolung Process
作者:Yunxiang Weng、Lin Min、Lidong Shan、Hongchen Li、Xinyan Wang、Yuefei Hu
DOI:10.1021/acs.joc.0c02015
日期:2021.1.1
A general and efficientsynthesis of fully substituted 4-aminodixazoles was developed based on the strategies of amide activation and umpolung reaction. In this method, 1,4,2-dioxazol-5-ones were introduced as a rare type of umpolung reagent bearing a nucleophilic N-atom that could be used well together with the activating agent Tf2O. Because 1,4,2-dioxazol-5-ones played triple roles as an umpolung
The present invention provides a condensed furan compound of the formula (I):
wherein Ring X is benzene, pyridine, or the like; Y is an optionally substituted amino, an optionally substituted cycloalkyl, an optionally substituted aryl, an optionally substituted saturated heterocyclic group, an optionally substituted unsaturated heterocyclic group; A is a single bond, lower alkylene, lower alkenylidene, lower alkenylene or an oxygen atom; R
3
is hydrogen or the like; and, R
4
is hydrogen, or the like, or pharmaceutically acceptable salts thereof, which is useful as a medicament, particularly, as an activated blood coagulation factor X inhibitor.
The present invention provides a carbamoyl-type benzofuran derivative of the formula [1]:
wherein Ring Z is a group of the formula:
etc.; A is a single bond, and the like; Y is a cycloalkanediyl group, etc.; R
4
and R
5
are the same or different and each is an optionally substituted lower alkyl group, etc.; R
1
is a halogen atom, etc.; Ring B of the formula:
is an optionally substituted benzene ring; and R
3
is a hydrogen atom. etc., or a pharmaceutically acceptable salt thereof, which is useful as an FXa inhibitor.