Asymmetric Addition of Alkoxy Ethynyl Anion to Chiral N-Sulfinyl Imines
摘要:
The addition of lithiated ynol ethers to chiral N-sulfinyl imines proceeds in high yield and diastereoselectivity. The selectivity is completely reversed by the addition of boron trifluoride. These alkoxypropargyl sulfinamides can be reduced to afford enol ethers, selectively oxidized to busyl derivatives, or the ynol ether can be hydrolyzed to afford beta-amino esters.
Mild Aminoacylation of Indoles and Pyrroles through a Three-Component Reaction with Ynol Ethers and Sulfonyl Azides
作者:Joshua S. Alford、Huw M. L. Davies
DOI:10.1021/ja5058967
日期:2014.7.23
An effective method for aminoacylation of indoles and pyrroles has been achieved. The transformation involves a multicomponent one-pot cascade reaction between indoles or pyrroles, ynol ethers, and sulfonylazides, creating four different bonds regioselectively through N-sulfonyltriazole intermediates. The oxo-tryptamines and oxo-pyrroloethanamines are generated in moderate to high yields under mild
Expedient and Facile One-Pot Syntheses of Triazole-Linked Glycoconjugates under Microwave Irradiation
作者:Asish Sen、Swarbhanu Sarkar、Samrat Dutta
DOI:10.1055/s-0031-1289728
日期:2012.4
Effective microwave assisted one-pot syntheses of triazole-O-glycoconjugates and triazolylglycosides involving sequential glycosylation and click chemistry are described.
Efficient and Practical Method for Synthesizing Optically Active Indan-2-ols by the Ti(O-<i>i</i>-Pr)<sub>4</sub>/2 <i>i</i>-PrMgCl-Mediated Metalative Reppe Reaction
作者:Takeshi Hanazawa、Kousuke Sasaki、Yuuki Takayama、Fumie Sato
DOI:10.1021/jo034391m
日期:2003.6.1
indan-2-ols 1 has been developed starting from readily accessible optically active 4-siloxy-1,6-alkadiynes 2 and ethynyl p-tolyl sulfone, where the metalative Reppe reaction mediated by an economical divalent titanium reagent, Ti(O-i-Pr)(4)/2 i-PrMgCl, is a key step.
Tandem Inter [4 + 2]/Intra [3 + 2] Cycloadditions of Nitroalkenes. The Bridged Mode (β-Tether)
作者:Scott E. Denmark、Julie A. Dixon
DOI:10.1021/jo9802168
日期:1998.9.1
A new variation of the tandem inter [4 + 2]/intra [3 + 2] cycloaddition of nitroalkenes has been developed. This method involves the Lewis acid-promoted [4 + 2] cycloaddition of nitro olefins 12 with 1-alkoxy-1,4-dienes 3. The resulting nitronates 13, bearing a C(5) tethered dipolarophile, undergo thermal, intramolecular [3 + 2] cycloaddition to afford stable tricyclic nitroso acetals 14, which can