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
Direct formation, and reactions of a carbonyl anion free from competitive nucleophiles
作者:Keith Smith、Kalyanaraman Swaminathan
DOI:10.1039/c39760000387
日期:——
At low temperature, in tetrahydrofuran (THF)–ether-pentane, ButLi abstracts a proton from bis(isopropyl)formamide to give LiCONPri2, which reacts with carbonyl compounds to give high yields of α-hydroxyamides.
在低温下,Bu t Li在四氢呋喃(THF)-醚-戊烷中从双(异丙基)甲酰胺中提取出一个质子,生成LiCONPr i 2,LiCONPr i 2与羰基化合物反应生成高产率的α-羟基酰胺。
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.
Fletcher, Andrew S.; Smith, Keith; Swaminathan, Kalyanaraman, Journal of the Chemical Society. Perkin transactions I, 1977, # 16, p. 1881 - 1883
作者:Fletcher, Andrew S.、Smith, Keith、Swaminathan, Kalyanaraman