Stereochemistry as a Tool in Deciphering the Processes of a Tandem Iminium Cyclization and Smiles Rearrangement
作者:Jinbao Xiang、Tong Zhu、Qun Dang、Xu Bai
DOI:10.1021/jo101798p
日期:2010.12.3
isomer. The former was rationalized by the postulation of a Cram’s chelate transition state leading to the cis product as kinetically favored. The latter was due to the equilibration between the trans/cis pair involving a carbocation intermediate and the steric hindrance, which prevented the cis isomer from undergoing the intramolecular nucleophilic substitution. This hypothesis was further supported