Cyclic Vinyl <i>p</i>-Tolyl Sulfilimines as Chiral Dienophiles: Diels−Alder Reactions with Furan and Acyclic Dienes
作者:José L. García Ruano、Carlos Alemparte、Fernando R. Clemente、Lorena González Gutiérrez、Ruth Gordillo、Ana M. Martín Castro、Jesús H. Rodríguez Ramos
DOI:10.1021/jo016174w
日期:2002.5.1
its Diels-Alderreactions with furan and acyclic dienes has been investigated. A complete pi-facial selectivity for 2, opposite to that observed from its precursor 1, is the main feature of all these cycloadditions. Moreover, the high exo selectivity observed in reactions of 2 with furan (not observed for 1) contrasts with the almost complete endo selectivity with other cyclic and acyclic dienes. Additionally
(<i>Z</i>)-3-<i>p</i>-Tolylsulfinylacrylonitrile as a Chiral Dienophile: Diels−Alder Reactions with Furan and Acyclic Dienes
作者:José L. García Ruano、Carlos Alemparte、Ana M. Martín Castro、Harry Adams、Jesús H. Rodríguez Ramos
DOI:10.1021/jo000963g
日期:2000.11.1
ile (1) as a chiral dienophile has been evaluated from its reactions with furan and acyclic dienes. Electrostatic interactions of the cyano group with the sulfinyl one restrict the conformational mobility around the C-S bond, thus controlling the pi-facial selectivity, which is almost complete in all cases, the approach of the diene from the less-hindered face of the dienophile (that bearing the lone