Synthesis of Enantiomerically Enriched 2,5-Dihydrofuran Derivatives from Easily Available Enantiomerically Enriched 2-Butyne-1,4-diols by Stereospecific Transformation
The transformation of enantiomericallyenriched 1,1,4-trisubstituted 4-acyloxy-2-butyn-1-ols 3 into 2,2,5-trisubstituted 3-acyloxy-2,5-dihydrofurans 5 with complete stereospecificity was achieved by an Ag(I)-mediated rearrangement of the monoesters 3 to allenic intermediates 4, followed by Ag(I)-assisted cyclization. A stereochemical analysis revealed that the newly formed carbon–oxygen bond in 5 was
CATALYTIC ENANTIOSELECTIVE ADDITION OF TERMINAL ALKYNES TO ALDEHYDES: PREPARATION OF (S)-(-)-1,3-DIPHENYL-2-PROPYN-1-OL AND (S)-(-)-4-METHYL-1-PHENYL-2-PENTYN-1,4-DIOL
作者:Takita, Ryo、Harada, Shinji、Ohshima, Takashi、Matsunaga, Shigeki、Shibasaki, Masakatsu、Fontaine, Shaun、Robinson, Julia、Danheiser, Rick L.