Syntheses of (+)-asperlin 1 were achieved via two different synthetic routes. 1,2-Addition of alpha-furyl anion to (2R,3S)-2-'butyldimethylsilyloxy-3-chlorobutanal 6 gave (1S,2R,3S)-1-(2-furyl)-2-'butyldimethylsilyloxy-3-chlorobutanol 7, which was converted to the chiral intermediate, (1S,2R,3R)-1-(2-furyl)-2,3-epoxybutanol 8 (37% overall yield from 6) for the synthesis of (+)-1. The second synthesis of (+)-asperlin 1 from (2R,3S)-6 was achieved in 8% overall yield, based on a combination of the indium-assisted stereoselective addition of 3-bromopropenyl acetate 9 to (2R,3S)-6 and the ring closing metathesis (RCM) using Grubbs catalyst. (C) 2008 Elsevier Ltd. All riehts reserved.
Studies on the sharpless asymmetric epoxidation of unsymmetrical divinylmethanols
作者:Toshio Honda、Hirotake Mizutani、Kazuo Kanai
DOI:10.1039/p19960001729
日期:——
A reaction of racemic unsymmetrical divinylmethanol rac-13 under the Sharpless asymmetric epoxidation conditions using stoichiometric amounts of titanium tetraisopropoxide [Ti(OPi)4], D-(–)-diisopropyl tartrate (DIPT) and tert-butyl hydroperoxide (TBHP) afforded R-14 and R-15 in 41 and 43% yield, each with > 99%ee, respectively, where the kinetic resolution and subsequent epoxidation had proceeded
Peculiar Sharpless kinetic resolution of 2-furylmethanol and its application to the synthesis of (+)-Asperlin
作者:Zhi-Cai Yang、Wei-Shan Zhou
DOI:10.1016/0040-4039(95)01170-m
日期:1995.7
A peculiar kineticresolution of E-1-(2-furyl)-2-buten-1-ol (1), which produced two oxidation products, pyranone (2) and epoxyalcohol (3), was developed by using the modified Sharplessreagents. A short synthesis of (+)-Asperlin was achieved starting from the opticallyactiveresolution products.
Concise Enantioselective Synthesis of (+)-Asperlin by Application of the Sharpless Kinetic Resolution to 2-Furylmethanol Derivatives Bearing Alkenyl Moiety on the Side Chain
作者:Toshio Honda、Nobuko Sano、Kazuo Kanai
DOI:10.3987/com-94-7001
日期:——
A reaction of (+/-)-(E)-1-(2-furyl)but-2-en-1-ol (1) under the Sharpless asymmetric oxidation condition using 30 mol% of D-(-)-diisopropyl tartrate (DIPT), 25 mol% of titanium tetraisopropoxide and 120 mol% of tert-butyl hydroperoxide (TBHP) afforded the (S)-epoxide (3), in 42% yield with high optical purity, which was further converted into an antitumour antibiotic, asperlin (10).
Yang, Zhi-Cai; Jiang, Xiao-Bin; Wang, Zhi-Min, Journal of the Chemical Society. Perkin transactions I, 1997, # 3, p. 317 - 321
Syntheses of (+)-asperlin 1 were achieved via two different synthetic routes. 1,2-Addition of alpha-furyl anion to (2R,3S)-2-'butyldimethylsilyloxy-3-chlorobutanal 6 gave (1S,2R,3S)-1-(2-furyl)-2-'butyldimethylsilyloxy-3-chlorobutanol 7, which was converted to the chiral intermediate, (1S,2R,3R)-1-(2-furyl)-2,3-epoxybutanol 8 (37% overall yield from 6) for the synthesis of (+)-1. The second synthesis of (+)-asperlin 1 from (2R,3S)-6 was achieved in 8% overall yield, based on a combination of the indium-assisted stereoselective addition of 3-bromopropenyl acetate 9 to (2R,3S)-6 and the ring closing metathesis (RCM) using Grubbs catalyst. (C) 2008 Elsevier Ltd. All riehts reserved.