Cyano phosphate: an efficient intermediate for the chemoselective conversion of carbonyl compounds to nitriles
摘要:
Cyanohydrin diethyl phosphates, readily obtained from various ketones and aldehydes by reaction with diethyl phosphorocyanidate and lithium cyanide, reacted chemoselectively with samarium(II) iodide in THF to give the corresponding nitriles in excellent yields. This method was also found applicable to alpha,beta-unsaturated carbonyl compounds via cyano phosphates to give beta,gamma-unsaturated nitriles, not obtainable by standard methods, without isomerization of the double bonds.
A Biomimetic Synthesis of Sacculatane Diterpenoids
作者:Marina Grinco、Veaceslav Kulciţki、Nicon Ungur、Pavel F. Vlad、Margherita Gavagnin、Francesco Castelluccio、Guido Cimino
DOI:10.1002/hlca.200890031
日期:2008.2
The biomimeticsynthesis of sacculatane-type epimeric compounds 14a and 14b is reported. The key synthetic step is the low-temperature superacidic cyclization of (all-E)-ω-acetoxygeranylgeraniol 12 obtained in nine steps from geranyllinalool (13). The 19-acetoxysacculata-7,17-dien-11-ol (14a) could be an important and convenient starting compound for the synthesis of other sacculatanediterpenoids.