Asymmetric Synthesis of (1'S,2'R)-Cyclopropyl Carbocyclic Nucleosides
摘要:
Enantiomeric synthesis of cyclopropyl carbocyclic nucleosides has been accomplished. The key intermediates 7 and 9 were synthesized from D-glyceraldehyde acetonide 1, which was converted to the alpha,beta-unsaturated ester 2 and then reduced to give allylic alcohol 3a. Stereoselective construction of the cyclopropyl ring of 3a and 3b followed by oxidation gave acid 5, which was treated under Curtius rearrangement conditions to obtain the urea intermediate 7. The urea intermediate was utilized to prepare uracil 14, thymine 15, and cytosine 18 nucleosides. The purine derivatives were prepared from cyclopropylamine 9 by condensation with 4,6-dichloro-5-form-amidopyrimidine or 4,6-dichloro-2-aminopyrimidine.
Asymmetric Synthesis of (1'S,2'R)-Cyclopropyl Carbocyclic Nucleosides
摘要:
Enantiomeric synthesis of cyclopropyl carbocyclic nucleosides has been accomplished. The key intermediates 7 and 9 were synthesized from D-glyceraldehyde acetonide 1, which was converted to the alpha,beta-unsaturated ester 2 and then reduced to give allylic alcohol 3a. Stereoselective construction of the cyclopropyl ring of 3a and 3b followed by oxidation gave acid 5, which was treated under Curtius rearrangement conditions to obtain the urea intermediate 7. The urea intermediate was utilized to prepare uracil 14, thymine 15, and cytosine 18 nucleosides. The purine derivatives were prepared from cyclopropylamine 9 by condensation with 4,6-dichloro-5-form-amidopyrimidine or 4,6-dichloro-2-aminopyrimidine.
Asymmetric Synthesis of Cyclopropyl Carbocyclic Nucleosides
作者:Y. F. Zhao、M. G. Lee、T. -F. Yang、B. K. Chun、J. F. Du、R. F. Schinazi、C. K. Chu
DOI:10.1080/15257779508012367
日期:1995.5.1
Abstract A number of nucleosides have been synthesized as potential antiviral and antitumor agents.1 More recently, various dideoxynucleosides have been synthesized and found to be potent anti-HIV agents.2 As a part of our drug discovery program for the treatment of HIV and HBV, we have initiated to synthesize cyclopropyl carbocyclic nucleosides as potential antiviral agents. Several papers regarding
Asymmetric Synthesis of (1'S,2'R)-Cyclopropyl Carbocyclic Nucleosides
作者:Yufen Zhao、Tefang Yang、Migyoung Lee、Doowon Lee、M. Gary Newton、Chung K. Chu
DOI:10.1021/jo00121a047
日期:1995.8
Enantiomeric synthesis of cyclopropyl carbocyclic nucleosides has been accomplished. The key intermediates 7 and 9 were synthesized from D-glyceraldehyde acetonide 1, which was converted to the alpha,beta-unsaturated ester 2 and then reduced to give allylic alcohol 3a. Stereoselective construction of the cyclopropyl ring of 3a and 3b followed by oxidation gave acid 5, which was treated under Curtius rearrangement conditions to obtain the urea intermediate 7. The urea intermediate was utilized to prepare uracil 14, thymine 15, and cytosine 18 nucleosides. The purine derivatives were prepared from cyclopropylamine 9 by condensation with 4,6-dichloro-5-form-amidopyrimidine or 4,6-dichloro-2-aminopyrimidine.