Hetero Diels-Alder cyclocondensation of F-alkyl aldehydes with the Danishefsky diene
摘要:
The heterocyclocondensation of F-alkylated aldehydes R-F(CH2)(n)CHO with Danishefsky's diene depends on the mutual vicinity of the carbonyl and the F-alkyl chain: when n = 4 it leads to 4-oxo pyr-2-ene 4, but when n = 0 the trimethylsilyloxypyrene 3 without methoxy elimination only results. (C) 1997 Published by Elsevier Science Ltd.