ISOQUINUCLIDINE DERIVATIVE AND METHOD FOR PRODUCING 1-CYCLOHEXENE-1-CARBOXYLIC ACID DERIVATIVE BY USING THE SAME
申请人:The University of Tokyo
公开号:EP2050752A1
公开(公告)日:2009-04-22
The present invention provides an isoquinuclidine derivative which can be used to easily synthesize oseltamivir or an analog thereof. In particular, the present invention provides an isoquinuclidine derivative represented by the following formula (1) or an enantiomer thereof:
wherein in the formula (1), A represents a protective group for the nitrogen atom; R1 to R1 each independently represent an alkyl group which may have a substituent, an aryl group which may have a substituent, or a hydrogen atom; and X represents a halogen atom.
METHOD OF FORMING OSELTAMIVIR AND DERIVATIVES THEREOF
申请人:Liu Xuewei
公开号:US20110021762A1
公开(公告)日:2011-01-27
A process is provided for the synthesis of 4,5-diamino cyclohexene carboxylate ester (1): or a pharmaceutically acceptable salt thereof. R
1
-R
3
are a silyl-, an aliphatic, alicyclic, aromatic, arylaliphatic, or an arylalicyclic group. R
4
, R
11
and R
12
are H, a silyl-group, an aliphatic, alicyclic, aromatic, arylaliphatic, or an arylalicyclic group. 3,4-Dihydropyran compound (9): with R
5
and R
6
being suitable protecting groups, is reacted to form aldehyde (4): which is oxidized and converted to N-substituted carbamate (3): with R
7
being a suitable protecting group. (3) is, via oxazolinidone (13): converted to azido carboxylate ester (2): and then to 4,5-diamino cyclohexene carboxylate ester (1).
is a potent inhibitor of neuraminidase, and is used worldwide as a drug for type A or B influenza. The industrial synthesis of oseltamivir uses shikimic acid as a starting material, but the price fluctuates, depending on the supply of star anise. We have developed a practical synthesis of oseltamivir from pyridine, which features an asymmetric Diels–Alder reaction of dihydropyridine using MacMillan's