Showing papers by "Sujit Roy published in 2007"
TL;DR: This 100% TRAM selective transformation is clean and eliminates the use of acid systems.
Abstract: Reactions of arenes and heteroarenes with aromatic aldehydes proceeded smoothly in the presence of a catalytic combination of [Ir(COD)Cl] 2 -SnCl 4 to afford the corresponding triarylmethane derivatives (TRAMs) in high yields. This 100% TRAM selective transformation is clean and eliminates the use of acid systems.
117 citations
TL;DR: In this article, the synthesis and properties of these special classes of ferrocenes having olefinic, and acetylenic and cumulenic backbones are discussed and a review of their properties is presented.
86 citations
TL;DR: A highly efficient secondary benzylation procedure has been demonstrated using a high-valent heterobimetallic complex as the catalyst in 1,2-dichloroethane to afford the corresponding benzylated products in moderate to excellent yields.
Abstract: A highly efficient secondary benzylation procedure has been demonstrated using a high-valent heterobimetallic complex [Ir2(COD)2(SnCl3)2(Cl)2(μ-Cl)2] 1 as the catalyst in 1,2-dichloroethane to afford the corresponding benzylated products in moderate to excellent yields The reaction was performed not only with carbon nucleophiles (arenes and heteroarenes) but also with oxygen (alcohol), nitrogen (amide and sulfonamide), and sulfur (thiol) nucleophiles Mechanistic investigation showed the intermediacy of the ether in this reaction An electrophilic mechanism is proposed from Hammett correlation
70 citations
TL;DR: In this article, an electrophilic mechanism was proposed from a Hammett correlation for the benzylation or allylation of arenes and heteroarenes using ethers as the alkylating agents.
35 citations
TL;DR: N-Tosyl aziridines react with a variety of arenes and heteroarenes in the presence of 1–2% of silver hexafluorophosphate at room temperature to afford the corresponding β-aryl amine derivatives in excellent yields and with high regioselectivity.
32 citations
TL;DR: In this article, a one-pot Barbier protocol is described for the facile formation of homoallyl sulfonamides from sulfonimines and allyl or crotyl bromide in the presence of SnCl2, and catalytic Pd2(dba)3·CHCl3 at room temperature.
15 citations
TL;DR: The 3-C 3 strategy involves (i) Pd(0)/SnX 2 (X = Cl, Cl, Br) mediated generation of allyltin(IV) from allyl bromide in anhydrous DCM, (ii) formation of homoallyloxytin (IV) intermediate I from allyltins and an aldehyde, and (iii) coupling of I with an amine, an aryl epoxide or an arene as the third partner to afford tetrahydropyrans, benzyl tetrah
13 citations
TL;DR: In this paper, a cis-addition of Sn-X bond across IrI/RhI is proposed from the analysis of the geometrical features of "X-M-Sn" triangular units in 1-5.
9 citations
1 citations
TL;DR: The 3-C 3 strategy involves (i) Pd(0)/SnX 2 (X = Cl, Cl, Br) mediated generation of allyltin(IV) from allyl bromide in anhydrous DCM, (ii) formation of homoallyloxytin (IV) intermediate I from allyltins and an aldehyde, and (iii) coupling of I with an amine, an aryl epoxide or an arene as the third partner to afford tetrahydropyrans, benzyl tetrah
Abstract: The 3-C 3 strategy involves (i) Pd(0)/SnX 2 (X = Cl, Br) mediated generation of allyltin(IV) from allyl bromide in anhydrous DCM, (ii) formation of homoallyloxytin(IV) intermediate I from allyltin(IV) and an aldehyde, and (iii) coupling of I with an aldehyde, an aryl epoxide or an arene as the third partner to afford tetrahydropyrans, benzyl tetrahydropyrans or 4,4-diarylbut-1-enes, respectively.
TL;DR: In this article, a 100% TRAM selective transformation is presented, which is clean and eliminates the use of acid systems, in the presence of a catalytic combination of [Ir(COD)Cl] 2 -SnCl 4 to afford the corresponding triarylmethane derivatives in high yields.
Abstract: Reactions of arenes and heteroarenes with aromatic aldehydes proceeded smoothly in the presence of a catalytic combination of [Ir(COD)Cl] 2 -SnCl 4 to afford the corresponding triarylmethane derivatives (TRAMs) in high yields. This 100% TRAM selective transformation is clean and eliminates the use of acid systems.
TL;DR: In this article, a highly efficient secondary benzylation procedure was demonstrated using a high-valent heterobimetallic complex [Ir2(COD)2(SnCl3),2(Cl)2μ-Cl) 2] 1 as the catalyst in 1,2-dichloroethane to afford the corresponding benzylated products in moderate to excellent yields.
Abstract: A highly efficient secondary benzylation procedure has been demonstrated using a high-valent heterobimetallic complex [Ir2(COD)2(SnCl3)2(Cl)2(μ-Cl)2] 1 as the catalyst in 1,2-dichloroethane to afford the corresponding benzylated products in moderate to excellent yields. The reaction was performed not only with carbon nucleophiles (arenes and heteroarenes) but also with oxygen (alcohol), nitrogen (amide and sulfonamide), and sulfur (thiol) nucleophiles. Mechanistic investigation showed the intermediacy of the ether in this reaction. An electrophilic mechanism is proposed from Hammett correlation.