PREPARATION METHOD OF LYCOPENE INTERMEDIATE 3-METHYL-4,4-DIALKOXY-1-BUTYRALDEHYDE
申请人:Nanjing University Of Technology
公开号:EP2799418B1
公开(公告)日:2017-04-12
VARLET J. M.; FABRE G.; SAUVEUR F.; COLLIGNON N.; SAVIGNAC P., TETRAHEDRON, 1981, 37, NO 7, 1377-1384
作者:VARLET J. M.、 FABRE G.、 SAUVEUR F.、 COLLIGNON N.、 SAVIGNAC P.
DOI:——
日期:——
US8993810B2
申请人:——
公开号:US8993810B2
公开(公告)日:2015-03-31
PREPARATION METHOD OF LYCOPENE INTERMEDIATE 3-METHYL-4,4-DIALKOXY-1-BUTALDEHYDE
申请人:NANJING UNIVERSITY OF TECHNOLOGY
公开号:US20140357900A1
公开(公告)日:2014-12-04
Disclosed is a preparation method of the lycopene intermediate 3-methyl-4,4-dialkoxy-1-butaldehyde. The preparation method comprises the following steps: (1) reacting 2-methyl-3,3-dialkoxy-1-halopropane with magnesium powder in the solvent of anhydrous tetrahydrofuran at a temperature of 45˜65° C. to generate a mixture of Grignard reagents under the protection of an inert gas; and (2) adding N,N-disubstituted carboxamide to the mixture of Grignard reagents and reacting at a temperature of 10° C.˜35° C. to obtain 3-methyl-4,4-dialkoxy-1-butaldehyde. The process route of the present invention is simple and direct, the operation is easy, the conditions are mild and the yield is good, and thus the invention has commercial value.
ω-Formylalkylphosphonates by acid hydrolysis of the corresponding acetals obtained from triethylphosphite and bromoacetals has been described. In aqueous solution in the presence of cyanide and amines these compounds give aminonitriles (Strecker) or hydantoins (Bucherer). These reactions give access to a large variety of compounds which by acid hydrolysis (Strecker) or basic then acid hydrolysis (Bucherer)