Lithiation of aliphatic 1-acylbenzotriazoles with subsequent reaction with alpha,beta-unsaturated ketones and aldehydes affords either 3,4,6-trisubstituted 3,4-dihydropyran-2-ones or 1,3-dienes depending on the carbonyl reagent used. Substituent effects on product yield and isomer ratio are discussed.
脂族1-酰基苯并三唑的
锂化,然后与α,β-不饱和酮和醛反应,根据所用的羰基试剂,可得到3,4,6-三取代的
3,4-二氢吡喃-2-酮或1,3-二烯。讨论了取代基对产物收率和异构体比率的影响。