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
DOI:10.1021/ja00286a036
日期:1986.12
Attainment of syn-selectivity for boron-mediated asymmetric aldol reactions of carboxylic esters
作者:Ji-Feng Liu、Atsushi Abiko、Zhonghua Pei、Dana C Buske、Satoru Masamune
DOI:10.1016/s0040-4039(98)00123-3
日期:1998.4
reagent for syn-selective aldolreactions has been developed based on the recent finding that the stereochemistry of the boron-mediatedaldolreaction of a carboxylic ester is controlled by the bulkiness of the alcohol moiety of the ester, by the proper choice of reagents, and by the enolization conditions. This readily available, inexpensive reagent has been utilized in studies directed towards the synthesis