A direct synthesis of β-carbolines via a three-step one-pot domino approach with a bifunctional Pd/C/K-10 catalyst
摘要:
A rapid, microwave-assisted synthesis of beta-carbolines via a Successive condensation/cyclization/dehydrogenation approach is described. This methodology involves the coupling of various tryptamines with aromatic aldehydes/glyoxals. The product imine undergoes a Pictet-Spengler cyclization followed by a final dehydrogenation to yield beta-carbolines in a three-step domino reaction. The use of the bifunctional catalyst Pd/C/K-10 combined with microwave irradiation enabled the synthesis of beta-carbolines in short reaction times and in good to excellent yields. (C) 2009 Elsevier Ltd. All rights reserved.
Multi‐birds with one stone: A cascade couplingstrategy was developed for the synthesis of β‐carbolines. The method can direct the synthesis of β‐carboline and isoquinoline‐containing natural products with high yields. Moreover, this protocol can also be further applied towards the totalsynthesis of natural products fascaplysin and papaverin (see scheme).
A rapid, microwave-assisted synthesis of beta-carbolines via a Successive condensation/cyclization/dehydrogenation approach is described. This methodology involves the coupling of various tryptamines with aromatic aldehydes/glyoxals. The product imine undergoes a Pictet-Spengler cyclization followed by a final dehydrogenation to yield beta-carbolines in a three-step domino reaction. The use of the bifunctional catalyst Pd/C/K-10 combined with microwave irradiation enabled the synthesis of beta-carbolines in short reaction times and in good to excellent yields. (C) 2009 Elsevier Ltd. All rights reserved.