Reverse-electron-demand diels-alder dienophile π-face selectivity via conformation dependent transmission of π-σ-π electronic interactions.
作者:J.Gabriel Garcia、Mark L. McLaughlin
DOI:10.1016/s0040-4039(00)92689-3
日期:1991.7
Reverse-electron-demand Diels-Alderreactions of a series of remotely substituted cyclooctenes with hexachlorocyclopentadiene and 5,5-dimethoxy-1,2,3,4-tetrachlorocyclopenta-2,4-diene indicate that dienophile π-face selectivity results from conformation dependent transmission of π-σ-π electronic interactions.
Tandem reverse-electron-demand diels-alder reactions of 1,5-cyclooctadiene.
作者:J.Gabriel Garcia、Frank R. Fronczek、Mark L. McLaughlin
DOI:10.1016/s0040-4039(00)92688-1
日期:1991.7
Hexachlorocyclopentadiene and 5,5-dimethoxy-1,2,3,4-tetrachlorocyclopenta-2,4-diene react with 1,5-cyclooctadiene to produce a 1:4 syn to anti mixture of diadducts in good yield. The stereochemistry of the diastereomers is examined using X my and molecular mechanics calculations are used to explore some of the potential causes for the observed diastereoselectivity.