Tosylated lithium 2-(lithiomethyl)-2-propen-1-olate: a γ-alkoxide allyl sulfone anion in organic synthesis
作者:Diego A. Alonso、Carmen Nájera、José M. Sansano
DOI:10.1016/s0040-4020(01)89690-3
日期:——
Dilithiated 2-(tosylmethyl)-2-propen-1-ol (6) functioned as a nucleophile at the α-position of the allylic anion in reactions with deuterium oxide, alkyl halides, and aldehydes, and in conjugate additions to α,β-unsaturated carbonyl compounds. With nitro-olefins conjugate addition occurred at the γ-position of the allylic anion. The hydroxy ester derived by reaction with tert-butyl bromoacetate was
在与氧化氘,烷基卤化物和醛的反应中,以及在与α,β的共轭加成反应中,二锂化的2-(甲苯磺酰基甲基)-2-丙烯-1-醇(6)在烯丙基阴离子的α位上起亲核试剂的作用。 -不饱和羰基化合物。对于硝基烯烃,共轭加成发生在烯丙基阴离子的γ-位。通过与溴乙酸叔丁酯反应得到的羟基酯被转化为各种合成上有用的二烯和β,γ-不饱和δ-内酯。还研究了一些羟基砜与钠汞齐的还原性脱甲苯基化作用。