The Use of N,N-Dialkyltrimethylsilylamines in the Synthesis of Pentamethinium Salts

Abstract

N,N-Dialkyltrimethylsilylamines were used for the synthesis of a series of pentamethinium salts starting from 2,6-disubstituted or 2,4,6-trisubstituted pyrylium salts, N-substituted 5-aminopenta-2,4-dienals or N-substituted 5-aminopenta-2,4-dien-1-ones. The reactions proceed smoothly under mild conditions, furnishing the desired products in good yields.

cyanines - pentamethinium salts - pyrylium salts - ring opening - amino aldehydes

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