Naphthalene-catalysed lithiation of carbamoyl and thiocarbamoyl chlorides under Barbier-type reaction conditions
作者:Diego J. Ramón、Miguel Yus
DOI:10.1016/0040-4020(96)00827-7
日期:1996.10
The reaction of different carbamoyl or thiocarbamoyl chlorides 1 with carbonyl compounds or imines 2 in the presence of an excess of lithium powder and a catalytic amount of naphthalene (3 mol %) in THF at −78°C leads, after hydrolysis with water, to the expected α-hydroxy or α-amino amides 3, respectively. In the case of allylic or benzylic derivatives 1a,c, when longer reaction times are used, the
Seebach,D. et al., Chemische Berichte, 1976, vol. 109, p. 1309 - 1323
作者:Seebach,D. et al.
DOI:——
日期:——
Carbamoyl and thiocarbamoyl lithium: A new route by naphthalene-catalysed chlorine-lithium exchange
作者:Diego J. Ramón、Miguel Yus
DOI:10.1016/s0040-4039(00)61613-1
日期:1993.10
The reaction of N,N-diisopropylcarbamoyl or N,N-dimethylthiocarbamoyl chloride (1a or 1b) with an excess of lithium powder and a catalytic amount of naphthalene (3 mol %) in the presence of a carbonyl compound 2 at temperatures ranging between -78 and 20-degrees-C, under Barbier-type conditions leads, after hydrolysis with water, to the corresponding alpha-hydroxy amides or thioamides 3, respectively.