Chirality Transfer from Carbon to Nitrogen to Carbon via Cyclic Ammonium Ylides
摘要:
Cyclic ammonium salts 2 were prepared by diastereoselective quaternization of nitrogen in the corresponding proline or threonine derivatives. Upon treatment with base, salts 2 underwent [1,2]- or [2,3]-shift to 3 with moderate to complete stereospecificity. The overall process entails chirality transfer from the original alpha carbon to the neighboring nitrogen and then back to the carbon.
Chirality Transfer from Carbon to Nitrogen to Carbon via Cyclic Ammonium Ylides
摘要:
Cyclic ammonium salts 2 were prepared by diastereoselective quaternization of nitrogen in the corresponding proline or threonine derivatives. Upon treatment with base, salts 2 underwent [1,2]- or [2,3]-shift to 3 with moderate to complete stereospecificity. The overall process entails chirality transfer from the original alpha carbon to the neighboring nitrogen and then back to the carbon.
Chirality Transfer from Carbon to Nitrogen to Carbon via Cyclic Ammonium Ylides
作者:Kevin W. Glaeske、F. G. West
DOI:10.1021/ol9905349
日期:1999.7.1
Cyclic ammonium salts 2 were prepared by diastereoselective quaternization of nitrogen in the corresponding proline or threonine derivatives. Upon treatment with base, salts 2 underwent [1,2]- or [2,3]-shift to 3 with moderate to complete stereospecificity. The overall process entails chirality transfer from the original alpha carbon to the neighboring nitrogen and then back to the carbon.