A diastereoselective route to 2,5-diaryl-3,4-disubstituted tetrahydrofuran lignans: protection free synthesis of (+)-galbelgin and (+)-galbacin
作者:Sunit Hazra、Saumen Hajra
DOI:10.1039/c3ra44573a
日期:——
An efficient and protection free asymmetric synthesis has been reported for all-trans variant 2,5-diaryl-3,4-disubstituted tetrahydrofuran lignans in seven steps from N-succinyl-2-oxazolidinone. (+)-Galbelgin and (+)-galbacin were synthesized in very good overall yields by this route where diastereoselective aldol reaction, stereoselective C-alkylation over O-alkylation and Friedel–Crafts reaction
已经报道了从N-琥珀酰基-2-恶唑烷酮通过七个步骤对全反式2,5-二芳基-3,4-二取代的四氢呋喃木脂素进行有效且无保护的不对称合成。(+)-Galbelgin和(+)-galbacin通过这种途径以非常好的总收率合成,其中非对映选择性羟醛反应,立体选择性C-烷基取代O-烷基化和Friedel-Crafts反应是关键步骤。