作者:Heinrich Becker、Marcos A. Soler、K. Barry Sharpless
DOI:10.1016/0040-4020(94)01021-q
日期:1995.1
The asymmetricdihydroxylation procedure (AD) is applied to a variety of polyenes. In many cases excellent regioselectivities are obtained. The observed selectivities are rationalized in terms of electronic and/or steric effects inherent to the substrate, superimposed on the substrate's favorable or unfavorable interactions with the binding pocket of the AD ligand. Surprisingly, for medium and large
Copper-Catalyzed Tandem Hydrocupration and Diastereo- and Enantioselective Borylalkyl Addition to Aldehydes
作者:Won Jun Jang、Jaesook Yun
DOI:10.1002/anie.201806937
日期:2018.9.10
report the copper‐catalyzed stereoselective addition of in situ generated chiral boron‐α‐alkyl intermediates to various aldehydes including α,β‐unsaturated aldehydes under mild conditions. This tandem and multicomponent method facilitated the synthesis of enantiomerically enriched 1,2‐hydroxyboronates bearing contiguous stereocenters in good yield with high diastereo‐ and enantioselectivity up to a ratio
Fluoride ion-catalyzed reduction of aldehydes and ketones with hydrosilanes. Synthetic and mechanistic aspects and an application to the threo-directed reduction of .alpha.-substituted alkanones
作者:Makoto Fujita、Tamejiro Hiyama
DOI:10.1021/jo00258a003
日期:1988.11
Enantio- and Diastereoselective Synthesis of 1,2-Hydroxyboronates through Cu-Catalyzed Additions of Alkylboronates to Aldehydes
作者:Matthew V. Joannou、Brandon S. Moyer、Simon J. Meek
DOI:10.1021/jacs.5b03477
日期:2015.5.20
The first catalytic enantio- and diastereoselective synthesis of 1;2-hydroxyboronates is reported. Reactions are promoted by a readily available chiral monodentate phosphoramidite copper complex in the presence of an alkyl 1,1-diboron reagent. Products contain two contiguous stereogenic centers and are obtained in up to 91% yield, >98:2 d.r., arid 98:2 e.r. The reaction is tolerant of aryl and vinyl aldehydes, and the 1,2-hydroxyboronate products can be transformed into versatile derivatives. Mechanistic experiments indicate control of absolute stereochemistry of the alpha-boryl component.
On the steric course of bakers' yeast reduction of .alpha.-hydroxy ketones