Compounds of the invention are useful in inhibiting thrombin and associated thrombotic occlusions having the following structure Formula (I): wherein u is CH or N; Q is 1)—N(R
25
)CH(R
30
)—wherein the nitrogen atom is attached to R
1
, and R
25
and R
30
are independently selected from the group consisting of hydrogen, C
3-6
cycloalkyl, and C
1-6
alkyl, or 2) wherein the nitrogen atom is attached to R
1
, and m is 0, 1, or 2.
1
Highly diastereoselective Michael addition of lithiated camphor imines of glycine esters to .alpha.,.beta.-unsaturated esters. Synthesis of optically pure 5-oxo-2,4-pyrrolidinedicarboxylates of unnatural stereochemistry
作者:Shuji Kanemasa、Akira Tatsukawa、Eiji Wada
DOI:10.1021/jo00008a052
日期:1991.4
The lithium enolates of camphor imines of glycine esters underwent highly diastereoselective Michael additions to alpha,beta-unsaturated esters. The tightly chelated structure of the Z,E enolates and the selective approach of the alpha,beta-unsaturated esters to the re face of the enolates were responsible for the high diastereoselectivity observed. The use of alkylidenemalonate acceptors led to the diastereospecific formation of Michael adducts. Removal of the camphor auxiliary of the adducts and concomitant cyclization led to optically pure enantiomeric 5-oxo-2,4-pyrrolidinedicarboxylates of unnatural stereochemistry.
Belokon', Yuri N.; Bulychev, Aleksandr G.; Pavlov, Viacheslav A., Journal of the Chemical Society. Perkin transactions I, 1988, p. 2075 - 2084
作者:Belokon', Yuri N.、Bulychev, Aleksandr G.、Pavlov, Viacheslav A.、Fedorova, Eugenia B.、Tsyryapkin, Vladimir A.、et al.
DOI:——
日期:——
KANEMASA, SHUJI;TATSUKAWA, AKIRA;WADA, EIJI, J. ORG. CHEM., 56,(1991) N, C. 2875-2883