CAS: 1729-67-5; Methyl 2,3-Dibromopropanoate

相似化合物

600-05-5 96-13-9 3674-13-3

上下游产品

CAS号292638-85-8 丙烯酸甲酯 | CAS号67-56-1 甲醇 | CAS号600-05-5 2,3-二溴丙酸 | CAS号4077-76-3 吡唑-3,5-二甲酸二甲酯 | CAS号3112-31-0 3,5-吡唑二甲酸 | CAS号4519-46-4 α-溴丙烯酸甲酯 | CAS号3663-79-4 1,4-苯并二噁烷-2-甲酸甲酯 | CAS号23003-39-6 3-Carboxylato-2... | CAS号22650-26-6 trimethyl cyclo... | CAS号1865-13-0 methyl 3-(benze... | CAS号25662-14-0 2-Aziridinecarb... | CAS号27704-96-7 2-溴-3-甲氧基丙酸甲酯 | CAS号5950-34-5 氮丙啶羧酸甲酯

专利信息

专利号:US-4111933-A
优先权日:1976-04-30
标题:Protection of functional groups during reaction and their subsequent restoration
发明人：ECKERT HEINER; UGI IVAR; KABBE HANS-JOACHIM
权利人:BAYER AG
摘要:In the process for preparing an organic compound of the formula n n A' -- X n n in which n X is an amino group, a hydroxyl group or a carboxyl group, and n A' is the remainder of the molecule, from an organic compound of the formula n n A -- X n n in which n A is the remainder of the molecule which can undergo reaction to form A', by converting A -- X into a compound of the formula n n A -- Z -- COOR n n in which n Z is --NH--, --O-- or a direct C--C bond, and n R is a radical of the formula ##STR1## IN WHICH Y is a direct C--C single bond, the --CHâ•?CH-- group or an arylene group, n R 1 to R 4 each independently is hydrogen, halogen or an alkyl, aryl, aralkyl, alkoxycarbonyl, alkylaminocarbonyl, arylaminocarbonyl or cycloalkylaminocarbonyl radical, or n R 1 + r 2 and R 3 + R 4 each independently completes a 5- or 6-membered carbocyclic ring, or n R 1 and R 3 conjointly with the grouping --C--Y--C-- forms a carbocyclic ring with 5 or 6 carbon atoms, and Hal is halogen, n Thereby to protect X, then converting A -- Z -- COOR into a compound of the formula n n A' -- Z -- COOR n n and then treating the compound A' -- Z -- COOR to restore the group X, the improvement which comprises effecting the treatment of the compound A' -- Z -- COOR with an alkali metal compound of a complex of monovalent cobalt. The process is applicable particularly to aminocarboxylic acids including intermediates from various stages of the synthesis of penicillins and cephalosporis.

专利号:CN-108129305-A
优先权日:2017-12-25
标题 :Method for continuous synthesis of E-alkoxy acrylate