(R)-2,3-O-Cyclohexylideneglyceraldehyde: a useful template for a simple entry into carbafuranose stereoisomers
摘要:
(R)-2,3-O-Cyclohexylideneglyceraldehyde 1 provides a simple route for the preparation of carbafuranoses. This has been exemplified by the preparation of 10c and 10d, the derivatives of carba D-xylofuranose and carba-L-arabinofuranose respectively, starting from homoallylic alcohol 2a derived from 1. The key step in this protocol was the intramolecular allylation of 9 promoted by several metals under wet conditions that resulted in the construction of the carbafuranose skeleton of 10. The potential of several metals regarding the efficacy and stereoselectivity of this crucial intramolecular allylation reaction has been studied. The moderate stereoselectivity in all of the successful intramolecular allylations of 9 yielding both D-10c and L-10d as the major products contributed significantly in attaining stereo-divergence in this route. The utility of this route was due to the easy availability of 1, and the operational simplicity as well as scalability of all of the reactions involved. (C) 2012 Elsevier Ltd. All rights reserved.
Concise synthesis of five-membered ring carbasugars based on key ring-closing metathesis
作者:Ya-Xi Yang、Zheng Li、Hui-Jin Feng、Guo-Rong Chen、Yuan-Chao Li
DOI:10.1016/j.tetlet.2010.05.069
日期:2010.7
A simple and efficient approach to the synthesis of five-membered ring carbasugars is achieved starting from readily available (R)-2,3-O-isopropylideneglyceraldehyde (2) through key ring-closingmetathesis (RCM) in high overall yield. We have also confirmed its viability by preparing the core bicyclo [3.1.0] hexane framework presented in the potent antiviral nucleoside N-MCT 1.
(R)-2,3-O-Cyclohexylideneglyceraldehyde: a useful template for a simple entry into carbafuranose stereoisomers
作者:Sibanarayan Tripathy、Angshuman Chattopadhyay
DOI:10.1016/j.tetasy.2012.09.007
日期:2012.10
(R)-2,3-O-Cyclohexylideneglyceraldehyde 1 provides a simple route for the preparation of carbafuranoses. This has been exemplified by the preparation of 10c and 10d, the derivatives of carba D-xylofuranose and carba-L-arabinofuranose respectively, starting from homoallylic alcohol 2a derived from 1. The key step in this protocol was the intramolecular allylation of 9 promoted by several metals under wet conditions that resulted in the construction of the carbafuranose skeleton of 10. The potential of several metals regarding the efficacy and stereoselectivity of this crucial intramolecular allylation reaction has been studied. The moderate stereoselectivity in all of the successful intramolecular allylations of 9 yielding both D-10c and L-10d as the major products contributed significantly in attaining stereo-divergence in this route. The utility of this route was due to the easy availability of 1, and the operational simplicity as well as scalability of all of the reactions involved. (C) 2012 Elsevier Ltd. All rights reserved.