Enantiospecific synthesis of (+)- and (–)-trachelanthic acids via asymmetric dihydroxylation and their conversion to the pyrrolizidine alkaloids indicine and intermedine
作者:Mitch Nambu、James D. White
DOI:10.1039/cc9960001619
日期:——
Asymmetric dihydroxylation of (E)-ethyl 2-isopropylbut-2-enoate with AD-mix-alpha and AD-mix-beta, followed by saponification, gives (-)- and (+)-trachelanthic acids, respectively, which are each coupled via their acetonides with (+)-retronecine to yield the pyrrolizidine alkaloids indicine and intermedine.