A convenient approach to β-heteroarylated (C–N bond) ketones from Cs2CO3 promoted reaction between propargyl alcohols and nitrogen-heterocycles
作者:M. Bhanuchandra、Malleswara Rao Kuram、Akhila K. Sahoo
DOI:10.1039/c2ob25165e
日期:——
effectively undergo redox-isomerization conjugate addition (RICA) with NH-heteroarenes. Reaction of 3-substituted pyrazoles or indazole with propargyl alcohols enables highly regioselective products. A diverse range of NH-bearing nucleophiles such as: pyrazoles, imidazole, triazoles, pyrrole, indoles and aniline participate in this reaction and deliver the corresponding β-heteroarylated ketones.
A radical cyclisation reaction based strategy to 2,3,5-tri- and tetrasubstituted furans
作者:A. Srikrishna、G. Sundarababu
DOI:10.1016/s0040-4020(01)90088-2
日期:1990.1
Synthesis of 2,3,5-trisubstituted furans (5), starting from 2-methoxypropene and 1,3-disubstituted propargylalcohols 3, via the radical cyclisation of the bromo acetal 4 followed by aromatisation, is reported. Analogously, l-methoxycyclohexene and propargylalcohols 3 furnished the tetrasubstituted furans 6.
Nickel‐Catalyzed Hydroborylative Polycyclization of Allenynes: an Atom‐Economical and Diastereoselective Synthesis of Bicyclic 5‐5 Fused Rings
作者:Inés Manjón‐Mata、M. Teresa Quirós、Elena Velasco‐Juárez、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/adsc.202101462
日期:2022.5.17
A diastereoselective synthesis of borylated bicyclic 5-5 fused ring systems by a domino Ni-catalyzed hydroborylative polycyclization of allenynes has been developed. The reaction provides two new C−C and one C−B bonds and constitutes an atom-economical method. It occurs rapidly, in absence of inert atmosphere, with an inexpensive Ni-based catalyst and HBpin as boron source. The procedure showed excellent
Chemoselective Isomerization of Secondary-Type Propargylic Alcohols to Propargylic/Allenic Bromides, and Brominated Dienes with Appel-Type Reaction Conditions
作者:Norio Sakai、Tsukasa Maruyama、Takeo Konakahara
DOI:10.1055/s-0029-1217701
日期:2009.8
Herein is described the chemoselective isomerization of secondary-type propargylicalcohols to allenic bromides, propargylicbromides and brominated dienes under Appel-type reaction conditions containing Ph 3 P, CBr 4 and additives.
2-Acyl-N-propargylindoles 1 and 2-acyl-3-propargylindoles 5 undergo aminobenzannulationreactions with pyrrolidine in the presence of an appropriate Lewisacid to give 9-aminopyrido[1,2-a]indoles 6 and 1-aminocarbazoles 7, respectively. The selection of the appropriate Lewisacid, TiCl4 or GaCl3 for 1 and InCl3 for 5, allows the domino process involving the initial formation of an enamine intermediate