[3 + 2] Cycloaddition of Nonstabilized Azomethine Ylides. 7. Stereoselective Synthesis of Epibatidine and Analogues<sup>,</sup>
作者:Ganesh Pandey、Trusar D. Bagul、Akhil K. Sahoo
DOI:10.1021/jo971728+
日期:1998.2.1
Epibatidine (1) is synthesized by employing a [3 + 2] cycloaddition strategy as a key step via nonstabilized azomethineylide 10, generated by one-electron oxidative double desilylation of N-benzyl-2,5-bis(trimethylsilyl)pyrrolidine (12). Cycloaddition of 10 with trans-ethyl-3-(6-chloro-3-pyridyl)-2-propenoate (22a) gives 26 in which the 6-chloro-3-pyridyl moiety is endo-oriented. Decarboxylation followed