Asymmetric Synthesis of 2-Acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazoles
摘要:
A method for preparing the eight stereoisomers of the biologically active compound (1R,2S,3R)-2-acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazole (THI, 1) is reported. This method employs a palladium(0)-catalyzed coupling of 1-(ethoxymethyl)-4-iodoimidazole (7) to functionalized vinylstannanes (R)- or (S)-12a,b or 13a,b or 1-alkynylstannanes (R)- or (S)-6a,b to introduce the C-4 imidazole four-carbon side chain. The 1,2-dihydroxy functionality of the butyl side chain was introduced by Sharpless catalytic asymmetric dihydroxylation reactions.
Asymmetric Synthesis of 2-Acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazoles
摘要:
A method for preparing the eight stereoisomers of the biologically active compound (1R,2S,3R)-2-acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazole (THI, 1) is reported. This method employs a palladium(0)-catalyzed coupling of 1-(ethoxymethyl)-4-iodoimidazole (7) to functionalized vinylstannanes (R)- or (S)-12a,b or 13a,b or 1-alkynylstannanes (R)- or (S)-6a,b to introduce the C-4 imidazole four-carbon side chain. The 1,2-dihydroxy functionality of the butyl side chain was introduced by Sharpless catalytic asymmetric dihydroxylation reactions.
Palladium catalysed coupling of imidazoles to alkynyl and vinyl substrates
作者:Matthew D Cliff、Stephen G Pyne
DOI:10.1016/0040-4020(96)00823-x
日期:1996.10
Methods for preparing 4-substituted imidazoles from the palladium(0) catalysed couplings of N-protected 4-haloimidazoles with alkynes or alkynyl- and vinyltrialkyltin derivatives or from the coupling reactions of 4-trimethylstannylimidazole 9 with aryl and vinyliodides and bromides under Stille conditions is reported.
Asymmetric synthesis of (1R, 2S, 3R)-2-acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazole
作者:Matthew D Cliff、Stephen G Pyne
DOI:10.1016/0040-4039(95)01155-b
日期:1995.8
A method for preparing the biologically active compound (1R, 2S, 3R)-2-acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazole1 using a palladium (0) catalysed coupling of 1-ethoxymethyl-4-iodoimidazole 2 to the functionalised vinylstannane 3 and the Sharpless catalytic asymmetric dihydroxylation is reported.