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  • Silica-supported polyphosphoric acid in the synthesis of 4-substituted tetrahydroisoquinoline derivatives.

Silica-supported polyphosphoric acid in the synthesis of 4-substituted tetrahydroisoquinoline derivatives.

Molecules (Basel, Switzerland) (2013-02-05)
Stanimir Manolov, Stoyanka Nikolova, Iliyan Ivanov
要旨

We report herein an application of an α-amidoalkylation reaction, as an alternative efficient synthesis of 4-aryl- and 4-methyl-1,2,3,4-tetrahydroisoquinoline derivatives. The amides required for this purpose would result from reaction of aminoacetaldehyde dimethylacetal with different substituted benzenes in polyphosphoric acid, followed by acylation of the obtained amines with different acid chlorides or sulfochlorides. We compared the cyclisation step using conventional (milieu of acetic-trifluoracetic acid = 4:1) and solid supported reagents (SiO₂/PPA), as recovered, regenerated and reused without loss of its activity catalyst. We found that in comparison to conventional methods, the yields of the reaction are greater and the reaction time is shorter.

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製品内容

Sigma-Aldrich
ポリリン酸, reagent grade, 115% H3PO4 basis
カタログ番号
容量
在庫状況
単価
数量
Sigma-Aldrich
ポリリン酸, ~105% H3PO4 basis
カタログ番号
容量
在庫状況
単価
数量