Carbonyl propargylation by 1-substituted prop-2-ynyl mesylates and carbonyl allenylation by 3-substituted prop-2-ynyl mesylates with tin(ii) iodide and tetrabutylammonium iodide
1-Substituted prop-2-ynyl mesylates cause propargylation of aldehydes with tin(II) iodide, tetrabutylammoniumiodide and sodium iodide in 1,3-dimethylimidazolidin-2-one to produce 2-substituted but-3-yn-1-ols, while 3-substituted prop-2-ynyl mesylates cause allenylation of aldehydes under the same conditions as those of the propargylation by 1-substituted prop-2-ynyl mesylates to produce 2-substituted
Chiral Brønsted Acid Catalyzed Enantioselective Synthesis of <i>anti</i>-Homopropargyl Alcohols via Kinetic Resolution–Aldehyde Allenylboration Using Racemic Allenylboronates
作者:Andy S. Tsai、Ming Chen、William R. Roush
DOI:10.1021/ol4003459
日期:2013.4.5
A chiral phosphoric acidcatalyzedkinetic resolution/allenylboration of racemicallenylboronates with aldehydes is described. Allenylboration of aldehydes with 2.8 equiv of allenylboronate (±)-1 in the presence of 10 mol % of catalyst (R)-2 provided anti-homopropargylalcohols 3 in 83–95% yield with 9:1 to 20:1 diastereoselectivity and 73–95% ee. The catalyst enables the kinetic resolution of the
Chiral Brønsted Acid Catalyzed Enantioselective Synthesis of <i>anti</i>-Homopropargyl Alcohols via Kinetic Resolution-Aldehyde Allenylboration Using Racemic Allenylboronates
作者:Andy S. Tsai、Ming Chen、William R. Roush
DOI:10.1021/ol400932e
日期:2013.5.3
The structures for 12 and 13 in the published Scheme 4 were inadvertently drawn incorrectly, with the methyl and cyclohexyl groups transposed in the original structures. The corrected Scheme 4 appears below. This article is cited by 1 publications.
Scope and stereochemical course of the addition of (trimethylsilyl)allenes to ketones and aldehydes. A regiocontrolled synthesis of homopropargylic alcohols
作者:Rick L. Danheiser、David J. Carini、Carrie A. Kwasigroch