Applications of Intramolecular Cyclopropanations of Chiral Secondary Allylic Diazoacetates
作者:Stephen F. Martin、Michael C. Hillier
DOI:10.1002/jccs.200000004
日期:2000.2
The diastereomeric secondaryallylicdiazoacetates 6a,b and 8a,b, which were readily prepared from the common intermediate 4, were cyclized in the presence of the achiral catalyst Cu(TBS)2 to furnish mixtures of the adducts 9a,b/10a,b and 12a,b/13a,b, respectively; in these cyclizations, the diastereoselectivity of the reaction was substrate controlled. When 6a,b and 8a,b were cyclized in the presence