作者:Stephen R. Wilson、A.M. Venkatesan、C.E. Augelli-Szafran、A. Yasmin
DOI:10.1016/s0040-4039(00)79918-7
日期:1991.5
A synthesis of 1,25-dihydroxy-vitamin D3 using a new acetylenic Ring-A precursor is described. Ring-A synthons 4a or 4b can be prepared in homochiral form by a disastereoselective diazoester cyclization.