Asymmetric dihydroxylation of primary allylic halides and a concise synthesis of (−)-diepoxybutane
摘要:
Tire asymmetric dihydroxylation (AD) of primary allylic halides is described. Enantiomeric excesses range from 40 to 98%. Subsequent base treatment gives epoxy alcohols in high yields. This strategy is further illustrated by the synthesis of (-)-diepoxybutane, an important C-4-chiral building block.
Highly Selective Hydrolytic Kinetic Resolution of Terminal Epoxides Catalyzed by Chiral (salen)Co<sup>III</sup> Complexes. Practical Synthesis of Enantioenriched Terminal Epoxides and 1,2-Diols
作者:Scott E. Schaus、Bridget D. Brandes、Jay F. Larrow、Makoto Tokunaga、Karl B. Hansen、Alexandra E. Gould、Michael E. Furrow、Eric N. Jacobsen
DOI:10.1021/ja016737l
日期:2002.2.1
The hydrolytickineticresolution (HKR) of terminal epoxides catalyzed by chiral (salen)Co(III) complex 1 x OAc affords both recovered unreacted epoxide and 1,2-diol product in highly enantioenriched form. As such, the HKR provides general access to useful, highly enantioenriched chiral building blocks that are otherwise difficult to access, from inexpensive racemic materials. The reaction has several
Synthesis of chiral nonracemic diols via nucleophilic opening of (S,S)-1,2,3,4-diepoxybutane
作者:Paul N. Devine、Taeboem Oh
DOI:10.1016/s0040-4039(00)92111-7
日期:1991.2
(S,S)-1,2,3,4-diepoxybutane was synthesized from (R,R)-dimethyl tartrate. Nucleophilic opening of this diepoxybutane gave a convenient method for generating a variety of chiral nonracemic diols.
Macroheterocycles; XXX. Synthesis of Chiral Cryptands and Polynuclear Crown Ethers
作者:N. G. Lukyanenko、A. S. Reder、L. N. Lyamtseva
DOI:10.1055/s-1986-31827
日期:——
Syntheses of novel chiral bi- and trinuclear crown ethers and cryptands by alkylation of mono- and diazacrown ethers with L-1,2:3,4-diepoxybutane are described.
The first syntheses of enantiopure 2,2′-biindoline
作者:Steven M. Wales、Anthony C. Willis、Paul A. Keller
DOI:10.1039/c0cc04045b
日期:——
The first two syntheses of chiral 2,2â²-biindoline are reported either in five steps from 2,2â²-bioxirane, or three steps from 2,2â²-biaziridine, both with exceptional enantiopurity.
Synthesis of 2‘,3‘-Didehydro-2‘,3‘-dideoxynucleosides by Reaction of 5‘-Protected Nucleoside 2‘,3‘-Dimesylates with Telluride Dianion: A General Route from <i>Cis</i> Vicinal Diols to Olefins
作者:Derrick L. J. Clive、Philip L. Wickens、Paulo W. M. Sgarbi
DOI:10.1021/jo9610570
日期:1996.1.1
treatment with telluride dianion in the form of the sodium or lithium salt. The method is well-suited to the preparation of unsaturated nucleosides that can be converted into compounds that are believed to be useful in the treatment of AIDS. The deoxygenation is general for vicinal dimesylates that have, or may adopt, a synperiplanar conformation. With straight chain compounds the reaction is stereospecific