Intramolecular Diels−Alder/1,3-Dipolar Cycloaddition Cascade of 1,3,4-Oxadiazoles
摘要:
Full details of a systematic exploration of the intramolecular [4+2]/[3+2] cycloaddition cascade of 1,3,4-oxadiazoles are disclosed in which the scope and utility of the reaction are defined.
Intramolecular Diels−Alder/1,3-Dipolar Cycloaddition Cascade of 1,3,4-Oxadiazoles
摘要:
Full details of a systematic exploration of the intramolecular [4+2]/[3+2] cycloaddition cascade of 1,3,4-oxadiazoles are disclosed in which the scope and utility of the reaction are defined.
Transannular Diels–Alder/1,3-Dipolar Cycloaddition Cascade of 1,3,4-Oxadiazoles: Total Synthesis of a Unique Set of Vinblastine Analogues
作者:Erica L. Campbell、Colin K. Skepper、Kuppusamy Sankar、Katharine K. Duncan、Dale L. Boger
DOI:10.1021/ol402549n
日期:2013.10.18
A powerful tandem [4 + 2]/[3 + 2] cycloaddition cascade of 1,3,4-oxadiazoles initiated by a transannular [4 + 2] cycloaddition is detailed. An impressive fourrings, fourcarbon–carbonbonds, and six stereocenters are set on each site of the newly formed central six-membered ring in a cascade thermal reaction that proceeds at temperatures as low as 80 °C. The resulting cycloadducts provide the basis