名称:
Chiral aminocyclopentene-based cycloaddition strategies to bicyclic [3.3.0] rings
摘要:
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.
DOI:
10.1016/j.tetasy.2013.04.014