Efficient removal of pipecolinate from rapamycin and FK506 by reaction with n-Bu4N+CN−
作者:Juan I. Luengo、Leonard W. Rozamus、Dennis A. Holt
DOI:10.1016/s0040-4039(00)60634-2
日期:1993.9
pipecolinate subunits, leading in good yields to compounds 3 and 12, respectively. Two sequential ring cleavage reactions take place: a fast cyanide-promoted fragmentation of the tricarbonyl functionality followed by a slower cyanide-catalyzed ester cleavage. The cyanide reagent provides a mild, chemoselective system for intramolecular transesterifications in structurally complex substrates.