Cyclization of allyl α-halocarboxylates in the presence of metallocomplex initiators
摘要:
Allyl trichloroacetate and allyl 2,2-dichloropropionate, unlike allyl bromoacetate and allyl 2-bromopropionate, undergo cyclization into gamma-lactones in the presence of a Fe(CO)(5)-amide system. All these esters undergo reductive dehalogenation under the action of the Bu(n)(3)SnH-AIBN system.
The synthesis and the physico-chemical properties of a series of bis(π-allyl-nickel haloacetates), which were found to be very efficient catalysts for the 1,4-stereo- specific polymerization of 1,3-butadiene, are reported.
A method for conveniently preparing 2,2-dichloro-12-(4-chlorophenyl)-10-hydroxydodecanoic acid useful as an active ingredient of therapeutic agents for diseases such as diabetes at a high yield, which comprises the step of reacting a compound represented by the following general formula (A):
wherein X represents a halogen atom, and a compound represented by the following general formula (B): CHCl2COOR1 wherein R1 represents hydrogen atom or a protective group of carboxyl group, to prepare a compound represented by the following general formula (C):
wherein R1 has the same meaning as that defined above.
Process for preparing acids via alpha-chloroepoxy esters
申请人:SmithKline Beecham Corporation
公开号:US20040220424A1
公开(公告)日:2004-11-04
This invention relates to a method for preparing certain acids of formula (I) via a chloroepoxy ester, which are useful as phosphodiesterase 4 inhibitors.
1
本发明涉及一种通过氯氧环酯制备式(I)某些酸的方法,其作为磷酸二酯酶4抑制剂具有用途。
METHOD FOR PREPARING CARBOXYLIC ACID COMPOUND
申请人:Katsurada Manabu
公开号:US20100261933A1
公开(公告)日:2010-10-14
A method for conveniently preparing 2,2-dichloro-12-(4-chlorophenyl)-10-hydroxydodecanoic acid useful as an active ingredient of therapeutic agents for diseases such as diabetes at a high yield, which comprises the step of reacting a compound represented by the following general formula (A):
wherein X represents a halogen atom, and a compound represented by the following general formula (B): CHCl
2
COOR
1
wherein R
1
represents hydrogen atom or a protective group of carboxyl group, to prepare a compound represented by the following general formula (C):
wherein R
1
has the same meaning as that defined above.