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
不同的氨基甲酰基或硫代氨基甲酰氯的反应1与羰基化合物或亚胺2在THF过量锂粉末和萘的催化量(3摩尔%)的在-78℃下引线的存在下,用水水解后,以预期的α-羟基或α-氨基酰胺3。在烯丙基或苄基衍生物1a,c的情况下,当使用更长的反应时间时,获得了由脱酰作用或脱苄基作用产生的相应产物4。使用DMF或异氰酸苯酯作为亲电试剂可得到取代的乙酰胺5。最后,当预先进行水解时,将过量的烷基氯加入到反应混合物中,形成1,2-二醇6,这是由于将原位生成的烷基锂最后两次加成至最初形成的α-羟基酰胺而产生的。