A series of propargylic tertiary alcohols decorated with an sp2-hybridised nitrogen donor were kinetically resolved by reagent-controlled dehydrogenative SiâO coupling with a strained, highly reactive silicon-stereogenic cyclic silane.
Potassium<i>tert</i>-Butoxide-Catalyzed Dehydrogenative SiO Coupling: Reactivity Pattern and Mechanism of an Underappreciated Alcohol Protection
作者:Andreas Weickgenannt、Martin Oestreich
DOI:10.1002/asia.200800426
日期:2009.3.2
As simple as it gets! Potassium tert‐butoxide alone catalyzes the direct dehydrogenative SiOcoupling of several synthetically important silanes with 1°, 2°, and even 3° alcohols without the need for stoichiometric hydrochloric acid scavengers. The stereoretentive mechanism is probed with a silicon‐stereogenic silane.
Stereoselective Alcohol Silylation by Dehydrogenative Si-O Coupling: Scope, Limitations, and Mechanism of the Cu-H-Catalyzed Non-Enzymatic Kinetic Resolution with Silicon-Stereogenic Silanes
silanes-a process that was found to proceed without racemization at the siliconatom if asymmetrically substituted. The present investigation starts from this pivotal observation since silicon-stereogenic silanes are thereby suitable for the reagent-controlled kinetic resolution of racemic alcohols, in which asymmetry at the siliconatom enables discrimination of enantiomeric alcohols. In this full account