Diastereoselective Synthesis of 2-Arylmethylene-6-hydroxyspiro[4.5]deca-7-ones via FeCl<sub>3</sub>·6H<sub>2</sub>O-Catalyzed Spiroannulation/Hydride Transfer of 6-(5-Arylpent-4-yn-1-yl)-7-oxabicyclo[4.1.0]heptan-2-ols
作者:Hsin-Hui Lin、Kuan-Yi Lee、Yin-An Chen、Chi-Fan Liu、Ming-Chang P. Yeh
DOI:10.1021/jo5023266
日期:2014.12.5
In the presence of a catalytic amount of FeCl3 center dot 6H(2)O, 6-(5-arylpent-4-yn-1-yl)-7-oxabicyclo[4.1.0]heptan-2-ols underwent attack of the pendant acetylene at the iron-activated oxirane to give a vinylic carbocation. Hydride transfer from the carbinol carbon to the newly formed cation center furnished 2-arylmethylene-6-hydroxyspiro[4.5]deca-7-ones in excellent stereoselectivity and good yields.