名称:
3-Chloropropyl and 4-Chlorobutyl Phenyl Ethers as Sources of 1,3-Dilithiopropane and 1,4-Dilithiobutane: Sequential Reaction with Carbonyl Compounds
摘要:
The reaction of 3-chloropropyl and 4-chlorobutyl phenyl ethers (1) with lithium powder and a catalytic amount of DTBB (5% molar) in THF at -78 degrees C followed by successive treatment with a carbonyl compound [(RRCO)-R-1-C-2 = (BuCHO)-C-t, Me2CO, (CH2)(5)CO, (-)-menthone] at -78 to 20 degrees C and, after 1.5 h at this temperature, with a second one [(RRCO)-R-3-C-4 = (BuCHO)-C-t, PhCHO, Me2CO, MeCOPrn, (CH2)(5)CO, (-)-menthone] at -78 degrees C leads,after hydrolysis with water, to the corresponding 1,5- and 1,6-diols (2). Because of the competition of two different reductive cleavages, 1,4- and 1,5-diols 3 were also obtained as side-reaction products.