Compounds represented by general formula (1) or salts thereof which have a matrix metalloprotease inhibitory activity and are useful as drugs, wherein the rings A and B represent each an optionally substituted homocycle or heterocycle, etc.; R1s are the same or different and each represents hydrogen, optionally substituted hydrocarbyl, acyl, etc.; X1 represents a bond, optionally substituted divalent aliphatic hydrocarbyl, etc.; X2 represents a bond, optionally substituted divalent aliphatic hydrocarbyl, —O—, etc.; Ys are the same or different represents hydrogen, optionally substituted hydrocarbyl, oxo, etc.; m is 0 or 1; n is an integer of 1 to 3; q1 is an integer of 1 to 2n+4; and q2 is an integer of 0 to 2n+3, provided that q1+q2 is 2n+4.
The present invention relates to compounds of formula (IV): ##STR1## wherein R.sup.a and R.sup.b each represent a hydrogen atom or together form an alkylidene group.
An Efficient Scalable Process for the Synthesis of <i>N-</i>Boc-2-<i>tert</i>-butyldimethylsiloxypyrrole
作者:Zhenping Tian、Michael Rasmussen、Steven J. Wittenberger
DOI:10.1021/op025532+
日期:2002.7.1
scalable process for the preparation of N-Boc-2-tert-butyldimethylsiloxy-pyrrole (TBSOP) is described. In a three-step, one-pot sequence (±)-4-amino-3-hydroxybutyric acid was converted to N-Boc-4-hydroxy-2-pyrrolidinone. This stable crystalline product was isolated by filtration directly from the reaction mixture. Dehydration followed by enolization and silylation produced the target compound without
Rapid access to cis-cyclobutane γ-amino acids in enantiomerically pure form
作者:Virginie André、Anne Vidal、Jean Ollivier、Sylvie Robin、David J. Aitken
DOI:10.1016/j.tetlet.2011.01.013
日期:2011.3
The (+)-(1R,2S) and (−)-(1S,2R) stereoisomers of 2-(aminomethyl)cyclobutane-1-carboxylic acid have been prepared using a short and efficient strategy, which employs the photochemical [2+2] cycloaddition reaction between ethylene and an unsaturated γ-lactam as the key step.
The present invention provides a carbamoyl-2-pyrrolidinone compound which has the following formula (2) and is useful as medicaments for treating senile dementia, i.e., as cerebral function improving agents and cerebral metabolism activators or anoxic brain damage protectives ##STR1## wherein R.sup.1 is a hydrogen atom, hydroxyl or lower alkyl substituted or unsubstituted with hydroxyl, and R.sup.3 is phenyl, tetrahydronaphthyl, pyridyl or thiazolyl having or not having lower alkoxyl, lower alkylamino, a halogen atom or halogenomethyl as a substituent. Further, the present invention provides novel carbamoyl-2-pyrrolidinone compounds represented by the formula ##STR2## wherein R.sup.1 is a hydrogen atom, hydroxyl or lower alkyl substituted or unsubstituted with hydroxyl, and R.sup.2 is phenyl, tetrahydronaphthyl, pyridyl or thiazolyl having or not having methoxy or lower alkylamino as a substituent, provided that when R.sup.1 is a hydrogen atom or unsubstituted lower alkyl, R.sup.2 is not unsubstituted phenyl.