Vinylogous Aldol Products from Chiral Crotylsilanes Obtained by Enantioselective Rh(II) and Cu(I) Carbenoid Si−H Insertion
摘要:
Enantioenriched homoallylic ethers containing a alpha,beta-unsaturated ester (syn-vinylogous aldol products) were directly accessed by Lewis acid catalyzed crotylation utilizing chiral silane 2. The reagents were prepared by enantioselective Si-H Insertion to an alpha-diazovinylacetates using Davies' Rh-2(DOSP)(4) catalyst or chiral Cu(I) Schiff base complex.
Rhodium(II) (S)-N-(arylsulfonyl)prolinate catalyzed asymmetric insertions of vinyl- and phenylcarbenoids into the SiH bond
作者:Huw M.L. Davies、Tore Hansen、James Rutberg、Paul R. Bruzinski
DOI:10.1016/s0040-4039(97)00205-0
日期:1997.3
Allylsilanes or benzylsilanes of high enantiomeric purity (77–95% ee) are formed from the rhodium(II) (S)-N-[p-(dodecylphenyl)sulfonyl]prolinate (1) catalyzed decomposition of vinyldiazomethanes or phenyldiazomethanes in the presence of dimethylphenylsilane (3).
Total Synthesis of (−)-Virginiamycin M<sub>2</sub>: Application of Crotylsilanes Accessed by Enantioselective Rh(II) or Cu(I) Promoted Carbenoid Si–H Insertion
作者:Jie Wu、James S. Panek
DOI:10.1021/jo202119p
日期:2011.12.16
A stereoselective synthesis of the antibiotic (−)-virginiamycin M2 is detailed. A convergent strategy was utilized that proceeded in 10 steps (longest linear sequence) from enantioenriched silane (S)-15. This reagent, which was prepared via a Rh(II)- or Cu(I)-catalyzed carbenoid Si–H insertion, was used to introduce the desired olefin geometry and stereocenters of the C1–C5 propionate subunit. A modified
Bifunctional Homoallylic Carbamates from Chiral Silane Additions to in Situ Generated <i>N</i>-Acyl Iminium Ions
作者:Jie Wu、Kai-Cheng Zhu、Ping-Wei Yuan、James S. Panek
DOI:10.1021/ol301428y
日期:2012.7.20
Homoallylic carbamates bearing an α,β-unsaturated ester or an allylic carbonate were generated respectively utilizing novel chiral silanes through Lewis acid promoted asymmetric aminocrotylation. Those bifunctional building blocks could further undergo Michael addition or cyclization to selectively form functionalized lactams, azetidines, and tetrahydropyrimidinones.
Vinylogous Aldol Products from Chiral Crotylsilanes Obtained by Enantioselective Rh(II) and Cu(I) Carbenoid Si−H Insertion
作者:Jie Wu、Yu Chen、James S. Panek
DOI:10.1021/ol100604m
日期:2010.5.7
Enantioenriched homoallylic ethers containing a alpha,beta-unsaturated ester (syn-vinylogous aldol products) were directly accessed by Lewis acid catalyzed crotylation utilizing chiral silane 2. The reagents were prepared by enantioselective Si-H Insertion to an alpha-diazovinylacetates using Davies' Rh-2(DOSP)(4) catalyst or chiral Cu(I) Schiff base complex.