Syntheses of bis(indolyl)-piperazine alkaloids, dragmacidin B and C, and dihydrohamacanthin A
摘要:
The syntheses of trans- and cis-isomers of dragmacidin C and 3,4-dihydrohamacanthin A, and dragmacidin B have been accomplished by condensation of two indolylglycines followed by cyclization and reduction. The relative stereochemistry of dragmacidin C was confirmed to be cis, which is distinct from that of other dragmacidins. (C) 2002 Elsevier Science Ltd. All rights reserved.
The first totalsynthesis of dragmacidin A has been accomplished using condensation of two indolylglycines followed by cyclization and reduction. The general and practical method for synthesis of indolylglycines via Wittig reaction, azide addition, and reduction from indolin-3-ones is also described.
The syntheses of trans- and cis-isomers of dragmacidin C and 3,4-dihydrohamacanthin A, and dragmacidin B have been accomplished by condensation of two indolylglycines followed by cyclization and reduction. The relative stereochemistry of dragmacidin C was confirmed to be cis, which is distinct from that of other dragmacidins. (C) 2002 Elsevier Science Ltd. All rights reserved.