The synthesis of (2S,4R,5R) and (2R,4R,5R)-2-(3-furyl)-4, 5-isopropylidenedioxytetrahydrofuran (4 and 5) and (2S,4R,5S)-5-ethoxy-2-(3-furyl)-4-hydroxytetrahydrofuran (37) from “diacetone glucose” (6) is described. A new approach to 1-(R) and 1-(S)-(3-furyl)-1, 2-dihydroxyethane from L-serine and D-mannitol, respectively, is described. These compounds are convenient chiral precursors for syntheses of
Asymmetric photocycloaddition between furan and chiral alkyl glyoxylates
作者:SŁawomir Jarosz、Aleksander Zamojski
DOI:10.1016/0040-4020(82)80228-7
日期:1982.1
High-pressure mercury lamp irradiation of chiral alkyl glyoxylates [R(−)-menthyl,R(−)- andS(+)-2-octyl,R(−)-andS(+)-2, 2-dimethyl-3-butyl] with furan led to alkyl 2,7-dioxabicyclo-[3.2.0] hept-3-ene-6-car☐ylates (13a–e) exhibiting low (2.5–7.3%) optical purity. Compounds13a–e were isomerized to alkyl 3-furylglycolates (14a–e) in good yield. ConfigurationS was assigned to levorotary methyl 3-furlymethoxyacetate