The C2 Selective Nucleophilic Substitution Reactions of 2,3-Epoxy Alcohols Mediated by Trialkyl Borates: The First <i>endo</i>-Mode Epoxide-Opening Reaction through an Intramolecular Metal Chelate
[reaction: see text] Highly efficient C2 selective substitution reactions of 2,3-epoxy alcohols with nucleophiles were developed by using NaN(3)-(CH(3)O)(3)B, NaSPh-(CH(3)O)(3)B, or NaCN-(C(2)H(5)O)(3)B system. The reaction proceeds through novel endo-mode epoxide opening of an intramolecular boron chelate, which was suggested from both experimental and quantum mechanic studies.
Acyclic stereoselection. 22. Diastereofacial selectivity in the Lewis acid mediated reactions of allylsilanes with chiral aldehydes and enones
作者:Clayton H. Heathcock、Syunichi Kiyooka、Todd A. Blumenkopf
DOI:10.1021/jo00196a022
日期:1984.11
Highly Diastereoselective <i>anti</i>-Aldol Reactions Utilizing the Titanium Enolate of <i>cis</i>-2-Arylsulfonamido-1- acenaphthenyl Propionate
作者:Arun K. Ghosh、Jae-Hun Kim
DOI:10.1021/ol034086n
日期:2003.4.1
[GRAPHIC]anti-Aldol reaction of Ti-enolate derived from cis-2-aryisulfonamido-1-acenaphthenyl propionate with representative aldehydes proceeded in excellent yield with high diastereoselectivity. Both enantiomers of cis-2-amino-1-acenaphthenol were synthesized employing lipase-catalyzed kinetic resolution as the key step.
Organoboron compounds in organic synthesis. 4. Asymmetric aldol reactions
作者:Satoru. Masamune、Tsuneo. Sato、ByeongMoon. Kim、Theodor A. Wollmann