Reactivity of in situ generated dihalomethyllithium towards dicarboxylic acid diesters and lactones: Synthetic applications
摘要:
The reaction of dicarboxylic acid diesters 1, with in situ generated dihalomethyllithium (1:1.4 molar ratio) at -78-degrees-C leads, after hydrolysis, to the corresponding dihalomethylketoesters 3. The same process using an excess of the carbenoid (1:4 molar ratio) yields the expected tetrahalodiketones 5. The reaction of these carbenoids with gamma- and delta-lactones 6 at -78-degrees-C yields, after hydrolysis, 2-(dihalomethyl) gamma- or delta-lactols 7 or 8, respectively. The reaction of lactols 7 or 8 with triethylsilane or allyltrimethylsilane in the presence of BF3.OEt2 affords the corresponding substituted tetrahydrofurans or pyrans 10 or 12. The use of epsilon-caprolactone as starting material in the reaction with dihalomethyllithium leads to the corresponding 1,1-dihalo-7-hydroxy-2-heptanones.
Photochemistry of α,α-disubstituted bicyclic cyclobutanones - a potential thermal-photochemical metathesis reaction
作者:Edward Lee-Ruff、Alan C. Hopkinson、Hira Kazarians-Moghaddam
DOI:10.1016/s0040-4039(00)81845-6
日期:1983.1
Under certain conditions the photolysis of α,α-disubstituted cyclobutanones give terminal olefinic esters. A two-stage thermal photochemical metathesis is described.