Enantiomeric synthesis of 3'-fluoro-apionucleosides was accomplished from 1,2-O-isopropylidene D-glyceraldehyde. The key intermediate, gamma,beta-unsaturated tert-fluoro ethyl ester 7 from the fluoro allylic alcohol derivative 5 was achieved via Claisen rearrangement reaction with a 90.4% enantioselectivity. The condensation of the intermediate 10 with silylated N-4-benzoylcytosine and 6-chloropurine followed by deprotection gave the desired pyrimidine and purine apionucleosides, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved.
Enantiomeric synthesis of 3'-fluoro-apionucleosides was accomplished from 1,2-O-isopropylidene D-glyceraldehyde. The key intermediate, gamma,beta-unsaturated tert-fluoro ethyl ester 7 from the fluoro allylic alcohol derivative 5 was achieved via Claisen rearrangement reaction with a 90.4% enantioselectivity. The condensation of the intermediate 10 with silylated N-4-benzoylcytosine and 6-chloropurine followed by deprotection gave the desired pyrimidine and purine apionucleosides, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved.
Enantiomeric synthesis of 3′-fluoro-apionucleosides using Claisen rearrangement
作者:Joon H. Hong、Kyeong Lee、Yongseok Choi、Chung K. Chu
DOI:10.1016/s0040-4039(98)00567-x
日期:1998.5
Enantiomeric synthesis of 3'-fluoro-apionucleosides was accomplished from 1,2-O-isopropylidene D-glyceraldehyde. The key intermediate, gamma,beta-unsaturated tert-fluoro ethyl ester 7 from the fluoro allylic alcohol derivative 5 was achieved via Claisen rearrangement reaction with a 90.4% enantioselectivity. The condensation of the intermediate 10 with silylated N-4-benzoylcytosine and 6-chloropurine followed by deprotection gave the desired pyrimidine and purine apionucleosides, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved.