The regioselective bromine-lithium exchange reaction of alkoxymethyldibromobenzene: A new strategy for the synthesis of tofogliflozin as a SGLT2 inhibitor for the treatment of diabetes
摘要:
The regioselective bromine-lithium exchange reaction of 2,4-dibromo-1-(1-methoxy-1methylethoxymethyl)benzene (2), which resulted in optimized selectivity of 220:1, is described. Applying this method to the synthesis of tofogliflozin (1) as a SGLT2 inhibitor is also described. Selective and sequential metalation-functionalization of 2 led to the synthesis of 1 in 47% overall yield. (C) 2016 Elsevier Ltd. All rights reserved.
Bridged metallocene complex for the (co) polymerization of olefins
申请人:ENICHEM S.p.A.
公开号:US20010031885A1
公开(公告)日:2001-10-18
A “bridged” bis-cyclopentadienyl complex which can be advantageously used for the formation of a catalytic system active in the (co)polymerization of ethylene and other a-olefins is represented by means of the following formula (II):
1
wherein: M represents a metal selected from titanium, zirconium or hafnium;
A′ and A″ each independently represent an anion containing an &eegr;
5
-cyclopentadienyl ring coordinated to M;
or R″ each independently represents a group of an anionic nature a-bound to the metal M;
B represents an unsaturated bivalent organic residue having from 1 to 30 carbon atoms bound, respectively, to the ring of group and to the -CH
2
- methylene group by means unsaturated carbon atoms.
This complex, combined with a suitable cocata forms a catalyst with a high activity in the poization of olefins, producing polymers with molecular weight, especially in the case of the merization of ethylene with a second &agr;-olefir.
CRYSTAL OF SPIROKETAL DERIVATIVES AND PROCESS FOR PREPARATION OF SPIROKETAL DERIVATIVES
申请人:Murakata Masatoshi
公开号:US20110306778A1
公开(公告)日:2011-12-15
The present invention provides a process for preparing a spiroketal derivative, via an intermediate represented by Formula (VI):
wherein variable groups and numbers are as defined in the specification, which can be produced from dihalobenzene derivatives in one pot reaction.
CRYSTAL OF SPIROKETAL DERIVATIVE, AND PROCESS FOR PRODUCTION THEREOF
申请人:Chugai Seiyaku Kabushiki Kaisha
公开号:EP2308886A1
公开(公告)日:2011-04-13
The present invention provides a process for preparing a spiroketal derivative, via an intermediate represented by Formula (VI):
wherein variable groups and numbers are as defined in the specification, which can be produced from dihalobenzene derivatives in one pot reaction.
CRYSTALLINE FORMS OF (1S,3'R,4'S,5'S,6'R)-6-[(4-ETHYLPHENYL)METHYL]-3',4',5',6'-TETRAHYDRO-6'- (HYDROXYMETHYL)SPIRO[ISOBENZOFURAN-1(3H) 2'-[2H]PYRAN]-3',4',5'-TRIOL
申请人:Chugai Seiyaku Kabushiki Kaisha
公开号:EP3170834A1
公开(公告)日:2017-05-24
The present invention relates to crystalline forms of the compound represented by Formula (XI), which is useful for preventing or treating diabetes.
本发明涉及由式(XI)代表的化合物的结晶形式,它可用于预防或治疗糖尿病。
PROCESS FOR THE PRODUCTION OF A SPIROKETAL DERIVATIVE