The regiochemistry and stereochemistry of 1,3-dipolar cycloadditions of 1-fluoro- and 1,1-difluoroallene
作者:W.R. Dolbier、G.D. Purvis III、M.J. Seabury、G.E. Wicks、C.R. Burkholder
DOI:10.1016/s0040-4020(01)81456-3
日期:——
1,3-Dipolar cycloadditions of diazoalkanes, nitrones and nitrileoxides occur with high regioselectivity to 1,1-difluoroallene and fluoroallene, and with variable syn or anti π-facial diastereoselectivity with regard to additions to the latter. The roles of steric effects, frontier molecular orbital effects, electrostatic interactions and other factors which may be involved in determining the observed
重氮烷,硝酮和一氧化氮的1,3-偶极环加成反应具有对1,1-二氟丙二烯和氟丙二烯的高区域选择性,并且对后者的加成具有可变的顺式或反π面非对映选择性。讨论了空间效应,前沿分子轨道效应,静电相互作用和其他因素在确定观测到的区域选择性和π面非对映选择性中的作用。