The N-Acyliminium Pictet−Spengler Condensation as a Multicomponent Combinatorial Reaction on Solid Phase and Its Application to the Synthesis of Demethoxyfumitremorgin C Analogues
摘要:
[GRAPHICS]L-Tryptophan immobilized on polystyrene-Wang resin was sequentially reacted with an aldehyde and Fmoc-amino acid chloride, This generates a transient N-acyliminium species which undergoes Pictet-Spengler condensation to give a mixture of cis and trans tetrahydro-beta-carbolines. Removal of the Fmoc protecting group, with concomitant diketopiperazine formation, results in cyclative cleavage of the desired products from the resin.
The <i>N</i>-Acyliminium Pictet−Spengler Condensation as a Multicomponent Combinatorial Reaction on Solid Phase and Its Application to the Synthesis of Demethoxyfumitremorgin C Analogues
作者:Haishan Wang、A. Ganesan
DOI:10.1021/ol991030d
日期:1999.11.1
[GRAPHICS]L-Tryptophan immobilized on polystyrene-Wang resin was sequentially reacted with an aldehyde and Fmoc-amino acid chloride, This generates a transient N-acyliminium species which undergoes Pictet-Spengler condensation to give a mixture of cis and trans tetrahydro-beta-carbolines. Removal of the Fmoc protecting group, with concomitant diketopiperazine formation, results in cyclative cleavage of the desired products from the resin.