Polyquinanes by [4 + 4] Cycloaddition−Transannular Cyclization
摘要:
[GRAPHICS]Photocycloaddition of 2-pyridones yields a rigid polycyclic product containing a 1,5-cyclooctadiene. The cis isomer, with the alkenes in close proximity, undergoes a transannular reaction when treated with chlorine to give a polyquinane product. The chlorination reaction involves migration of an amide nitrogen and forms a single isomer, generating eight stereogenic centers in two steps.
Intermolecularly selective [4+4] photocycloaddition of 2-pyridone mixtures
作者:Scott McN Sieburth、Chao-Hsiung Lin
DOI:10.1016/0040-4039(95)02417-4
日期:1996.2
4-Alkoxy-2-pyridones do not undergo [4+4] photodimerization but will react with other 2-pyridones to yield highly functionalized cyclooctadienes with differentiated functional groups.