efficient asymmetric synthesis of LFA-1antagonistBIRT-377 using enantioselective phase-transfer catalytic alkylation has been developed. The alkylation of α-monosubstituted tert-butyl methyl malonate was catalyzed by a quaternary ammonium salt derived from a cinchona alkaloid to obtain the product with a quaternary stereogenic carbon in high yield and with high enantioselectivity. The chiral α,α-disubstituted
Stereodivergent synthesis of the LFA-1 antagonist BIRT-377 by porcine liver esterase desymmetrization and Curtius rearrangement
作者:Aaron Johnson、Matthew J. Saunders、Thomas G. Back
DOI:10.1039/c4ob02303j
日期:——
BIRT-377 was synthesized by enzymatic desymmetrization in conjunction with Curtius rearrangement, affording a key α-quaternary amine intermediate in high ee.