Chiral aminocyclopentene-based cycloaddition strategies to bicyclic [3.3.0] rings
作者:Chaozhong Cai、Fu-An Kang、Derek A. Beauchamp、Zhihua Sui、Ronald K. Russell、Christopher A. Teleha
DOI:10.1016/j.tetasy.2013.04.014
日期:2013.6
Two cycloaddition methods were applied to chiral protected aminocyclopentenes 2 and 9 and provided novel bicyclic products 3 and 4 in good yields. The explanation for the observed stereochemistry was based on the sterically encumbered beta-face forcing the cycloadditions to occur on the alpha-face of the cyclopentene ring. The stereochemistry of 4 was confirmed by X-ray of the fumarate salt 10 and showed the trans-relationship between the newly formed ring and the chiral -NHBoc group. (C) 2013 Elsevier Ltd. All rights reserved.