181472-59-3Relevant articles and documents
α-Aminated methyllithium by DTBB-catalysed lithiation of a N- (chloromethyl) carbamate
Ortiz, Javier,Guijarro, Albert,Yus, Miguel
, p. 4831 - 4842 (2007/10/03)
The reaction of O-tert-butyl-N-(chloromethyl)-N-methyl carbamate (1) with lithium powder and a catalytic amount of 4,4'-di-tert-butylbiphenyl (DTBB, 2.5 mol %) in the presence of different electrophiles [Me3SiCl, (i)BuCHO, (t)BuCHO, PhCHO, 4-MeOC6H4CHO, (CH2)4CO, MeCO(n)Pr, Et2CO, MeCO(CH2)2CH=CH2, PhCOMe, PhCO(n)Bu, Ph2CO] in THF at -78°C leads, after hydrolysis with water, to the expected functionalised carbamates 2. Carbamates 2 derived from carbonyl compounds are deprotected with hydrogen chloride (for aromatic aldehyde or ketone derivatives) or with a mixture of phenol and trimethylsilyl chloride (for aliphatic aldehyde derivatives) giving substituted 1,2-diols 4.
α-Nitrogenated organolithium compounds from N-(tosylmethyl)amides
Alonso, Diego A.,Alonso, Emma,Nájera, Carmen,Yus, Miguel
, p. 491 - 492 (2007/10/03)
Deprotonation of α-amido sulfones 7 with BunLi at -90°C followed by reaction with electrophiles leads, depending on the substitution on the amidic nitrogen to enamides 10 (secondary amides 7a,b) or functionalised α-amido sulfones 12 (tertiary amides 7c,d). Naphthalene-catalysed lithiation of tertiary α-amido sulfones 7c,d in the presence of electrophiles (Barbier conditions) at -78°C affords functionalised amides 13.