Cyclopropane Reaction Mechanisms

A new tris(1-benzyl-1H-1,2,3-triazol-4-yl)methanol ligand 3 has been prepared by a triple Cu(I)-catalyzed alkyne-azide 1,3-dipolar cycloaddition (CuAAC). Ligand 3 forms a stable complex with CuCl, which catalyzes the Huisgen 1,3-dipolar cycloaddition on water or under neat conditions. Low catalyst loadings, short reac…

• SALİH ÖZÇUBUKÇU

A variety of neutral ruthenium−carbene complexes RuCl 2 (carbene)(arene) 1 (carbene = C(NR)C 6 H 4 (NR), R = Me ( a ), Et ( b ); arene = p -Me-C 6 H 4 - i Pr ( 1 ), C 6 H 3 Me 3 ( 2 ), C 6 Me 6 ( 3 )) have been prepared by reaction of [RuCl 2 (arene)] 2 precursors with the enetetraamines (RN)C 6 H 4 (RN)C C(NR)C 6 H 4…

• HASAN KÜÇÜKBAY

Synthesis of pyrazoles via electrophilic cyclization of α,β-alkynic hydrazones by copper(I) iodide is described. When treated with copper(I) iodide in the presence of triethylamine in refluxing acetonitrile, α,β-alkynic hydrazones, prepared readily from hydrazines and propargyl aldehydes and ketones, undergo electroph…

• METİN ZORA

Synthesis of pyrazoles via electrophilic cyclization of α,β-alkynic hydrazones by copper(I) iodide is described. When treated with copper(I) iodide in the presence of triethylamine in refluxing acetonitrile, α,β-alkynic hydrazones, prepared readily from hydrazines and propargyl aldehydes and ketones, undergo electroph…

• ARİF KIVRAK

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• BARIŞ BİNAY

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• ECE ÖZDEMİR BABAVATAN

The Sc(OTf)3-catalyzed (3 + 2)-annulation of donor-acceptor cyclopropanes and ynamides is described, providing the corresponding cyclopentene sulfonamides in good to excellent yield. Deprotection and hydrolysis of the resulting ensulfonamides delivers 2,3-substituted cyclopentanones with high diastereoselectivity.

• MERYEM FISTIKÇI EŞSİZ

The copper(I)-catalyzed Huisgen [3 + 2] cycloaddition is a general reaction encompassing wide ranges of organoazide and primarily terminal alkyne reacting partners. Strained internal alkynes can also undergo cycloaddition with azides. We report here that tetrakis(acetonitrile)copper(I) hexafluorophosphate catalyzes th…

• NİHAL DELİGÖNÜL

A new type of carbene precursor, 1,5,6,7,8,8a-hexahydroimidazo[1,5- a ]pyridine ( 1 ), has been prepared from 2-(aminomethyl)piperidine and N,N -dimethylformamide dimethylacetal. The reactions of three imidazolidinium salts with [Rh(acac)(COD)] and [Ir(μ-OMe)(COD)] 2 were found to afford rhodium and iridium complexes…

• HAYATİ TÜRKMEN

The tandem hydroamination-annulation reaction of 4-pentyne-nitriles in the presence of amine nucleophiles and a cooperatively operating catalyst system, consisting of Ph(3)PAuCl and Zn(ClO(4))(2), provides an efficient route to 2-aminopyrroles. Two regioisomeric 2-aminopyrroles were formed in moderate to good yields.

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• BEGÜM EVRANOS AKSÖZ

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• KEMAL YELEKÇİ