In tandem reactions, cyclopropylcarbinols are obtained from allyloxylithium or -magnesium intermediates, generated in situ by alkylation of conjugated aldehydes, ketones, and esters as well as from allyl carboxylates or vinyloxiranes. Using this methodology, numerous fragrance ingredients and their precursors were efficiently converted to the corresponding cyclopropylcarbinols.
from α-substituted (homo)allyl alcohols. In tandem reactions, cyclopropyl carbinols are obtained from allyloxylithium or -magnesium intermediates, generated in situ by alkylation of conjugated aldehydes, ketones, and esters as well as from allyl esters and carbonates or vinyloxiranes. [¹] cyclopropanation - Barbier conditions - Grignard addition - alkyllithiumaddition - dibromomethane
An Effective and Highly Stereoselective Julia Olefination of Cyclopropyl Carbinol Mediated by CeCl<sub>3</sub>·7H<sub>2</sub>O/NaI
作者:Wei-Dong Z. Li、Yu Peng
DOI:10.1021/ol051051+
日期:2005.7.1
text] An efficient and highly stereoselectivesynthesis of functionalized trisubstituted E-olefins from cyclopropyl carbinol derivatives via a Julia-type olefination mediated by an intriguing Lewis acidic system consisting of CeCl(3).7H(2)O and NaI in refluxing acetonitrile is reported. This facile olefination allows for the iterative incorporation of methylcyclopropyl ketone as a C(5) prenylation synthon
Potent Triazole Bisphosphonate Inhibitor of Geranylgeranyl Diphosphate Synthase
作者:Veronica S. Wills、Cheryl Allen、Sarah A. Holstein、David F. Wiemer
DOI:10.1021/acsmedchemlett.5b00334
日期:2015.12.10
Studies of triazole bisphosphonates have resulted in identification of a potent inhibitor of geranylgeranyl diphosphate synthase (IC50 = 45 nM) with very good selectivity for this enzyme over farnesyl diphosphate synthase (IC50 = 28 mu M). This compound also potently disrupts geranylgeranylation and induces cytotoxicity in human myeloma cells at submicromolar levels, suggesting that it may serve as a lead compound for treatment of malignancies characterized by excessive protein secretion.