作者:Scott D. Rychnovsky、Jay P. Powers、Teresa J. LePage
DOI:10.1021/ja00048a005
日期:1992.10
Reductivedecyanations of 2-cyanotetrahydropyran derivatives with sodium in ammonia show a strong preference for axial protonation. For the 2-cyanotetrahydropyran 6, the selectivity is 119:1, and for the cyanooxadecalin 13, which is sterically biased against axial hydrogen introduction, the ratio is 1.78:1. These stereochemical outcomes and ab initio calculations of the intermediateradical conformations