Intramolecular addition of alkyllithiums to acetylenes: Regiospecific 4-, 5-, and 6-exo-dig cyclizations
作者:William F. Bailey、Timo V. Ovaska
DOI:10.1016/s0040-4039(00)94585-4
日期:1990.1
Primary acetylenic alkyllithiums bearing a phenyl substituent on the triple bond, which may be prepared in virtually quantitative yield by low-temperature lithium-iodine interchange, undergo regiospecific exo-dig cyclization via stereoselective syn-addition of CH2Li to the carbon-carbon triple bond to give four-, five-, and six-membered carbocycles bearing an easily functionalized exocyclic lithiomethylidene
可以通过低温锂-碘交换以几乎定量的方式制备在三键上带有苯基取代基的炔基烷基锂,并通过将CH 2 Li立体选择性合加成到碳-碳三元基团上进行区域特异性的ex-dig环化反应结合形成具有容易官能化的环外硫代亚甲基部分的四元,五元和六元碳环。类似的烷基取代的炔基烷基锂的环化限于5 -exo-dig模式。